# Glossary A B C D E F G H I J K L M N O P Q R S T U V W XYZ Search glossary terms:

Browse terms related to these fuel groups: alternative fuels coal electricity natural gas nuclear petrol eum renewable 

### A
AC: Alternating Current ACBM: Acronym for "asbestos-containing building material." Account classification: The way in which suppliers of electricity, natural gas, or fuel oil classify and bill their customers. Commonly used account classifications are "Residential," "Commercial," "Industrial," and "Other." Suppliers' definitions of these terms vary from supplier to supplier. In addition, the same customer may be classified differently by each of its energy suppliers. Account of others (natural gas): Natural gas deliveries for the account of others are de liveries to customers by transporters that do not own the natural gas but deliver it for others for a fee. Included are quantities covered by long-term contr acts and quantities involved in short-term or spot market sales. Accounting system: A method of recording accounting data for a utility o r company or a method of supplying accounting information for controlling, evaluating, planning and decision-making. Acid mine drainage: This refers to water pollution that results when sulfu r-bearing minerals associated with coal are exposed to air and water and form sulfuric acid and ferrous sulfate. Th e ferrous sulfate can further react to form ferric hydroxi de, or yellow boy, a yellow-orange iron precipitate found in streams and rive rs polluted by acid mine drainage. Acid rain: Also called acid precipitation or acid deposition, acid rain is precipitation containing harmful amounts of nit ric and sulfuric acids formed primarily by sulfur dioxide and nitrogen oxid es released into the atmosphere when fossil fuels are bur ned. It can be wet precipitation (rain, snow, or fog) or dry precipitatio n (absorbed gaseous and particulate matter, aerosol part icles or dust). Acid rain has a pH below 5.6. Normal rain has a pH of about 5.6, w hich is slightly acidic. The term pH is a measure of acidity or alkalinity and ranges from 0 to 14. A pH measurement of 7 is regarded as neutral. Measurements below 7 indicate increased acid ity, while those above indicate increased alkalinity. Acquisition (foreign crude oil): All transfers of ownership of foreign crude oil to a firm, irrespective of the terms of that transfer. Acquisitions thus include all purchases and exchange receipts a s well as any and all foreign crude acquired under reciprocal buy-sell agreements or acquired as a result of a buy-back or other preferential agreement with a host government. Acquisition (minerals): The procurement of the legal right to explore for a nd produce discovered minerals, if any, within a specific area; that legal right may be obtained by mineral lea se, concession, or purchase of land and mineral rights or o f mineral rights alone. Acquisition costs, mineral rights: Direct and indirect costs incurred to acquire legal righ ts to extract natural resources. Direct costs include costs incurred to obtain options to lease or purcha se mineral rights and costs incurred for the actual leasing (e.g., lease bonuses) or purchasing of the rights. Indirect costs include such costs as brokers' commissions and expenses; abstract and recordi ng fees; filing and patenting fees; and costs for legal exam ination of title and documents. Acre-foot: The volume of water that will cover an area of 1 acreto a depth of 1 foot. 

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1 of 9 8/31/2015 8:46 AMAcreage: An area, measured in acres, that is subject to ownershipor control by those holding total or fractional shares o f working

interests. Acreage is considered developed when developmenthas been completed. A distinction may be made between " gross" acreage and "net" acreage: Gross - All acreage covered by any working interest, regardl ess of the percentage of ownership in the interest. Net - Gross acreage adjusted to reflect the percentage ofownership in the working interest in the acreage. Active power: The component of electric power that performs work, typ ically measured in kilowatts (kW) or megawatts(MW). Also known as "real power." The terms "active" or "real" are used to modify the base term "power" to differentiate it from Reactive Power. See Power, Reactive Power, Apparent Power Active solar: As an energy source, energy from the sun collected and sto red using mechanical pumps or fans to circulate heat-laden fluids or air between solar collectors and a building. Actual peak reduction: The actual reduction in annual peak load (measured in kilowatts) achieved by customers that participate in a utility demand-side management (DSM) program. It refl ects the changes in the demand for electricity resulting from a utility DSM program that is in effect at the same time the utility experiences its annual peak load, as opposed to the install ed peak load reduction capability (i.e., potential peak reduction). It should a ccount for the regular cycling of energy efficient units du ring the period of annual peak load. Adequacy (electric): The ability of the electric system to supply the aggregat e electrical demand and energy requirements of the end-use customers at all times, taking into account scheduled and reasonably expected unscheduled outages of system elemen ts. NERC definition Adjustable speed drives: Drives that save energy by ensuring the motor's speed is p roperly matched to the load placed on the motor. Terms used to describe this category include polyphasemotors, motor oversizing, and motor rewinding. Adjusted electricity: A measurement of electricity that includes the approximate amount of energy used to generate electricity. To approximate the adjusted amount of electricity, the site -value of the electricity is multiplied by a factor of 3. This conversion factor of 3 is a rough approximation of the Btu value of raw fuels used to generate electricity in a steam-generation powerplant. Adjustment bid: A bid auction conducted by the independent system operat or or power exchange to redirect supply or demand of electricity when congestion is anticipated. Administrative and general expenses: Expenses of an electric utility relating to the overall directions of its corporate offices and administrative affairs, as contrasted with expenses incurred for specialized functions. Examples include office salaries, o ffice supplies, advertising, and other general expenses. Advance royalty: A royalty required to be paid in advance of production from a mineral property that may or may not be recovera ble from future production. Advances from municipality: The amount of loans and advances made by the municipali ty or its other departments to the utility department when such loans and advances are subject to repayment but not subject to current settlement. Advances to municipality: The amount of loans and advances made by the utility d epartment to the municipality or its other departments when such loans or advances are subject to curren t settlement. Adverse water conditions: Reduced stream flow, lack of rain in the drainage basi n, or low water supply behind a pondage or reservoir dam resulting in a reduced gross head that limi ts the production of hydroelectric power or forces restricti ons to be placed on multipurpose reservoirs or other water uses. Adverse Weather Conditions: Reduced streamflow, lack of rain in the drainage basi n, or low water supply behind a pondage or reservoir dam resulting in a reduced gross head that limi ts the production of hydroelectric power or forces restricti ons to be placed on multipurpose reservoirs or other water uses. 

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2 of 9 8/31/2015 8:46 AMAffiliate: An entity which is directly or indirectly owned, operate d, or controlled by another entity. See Firm

. Afforestation: Planting of new forests on lands that have not been r ecently forested. Aftermarket converted vehicle: A standard conventionally fueled, factory-produced vehicl e to which equipment has been added that enables the vehicle to operate on alternative fuel

. Aftermarket vehicle converter: An organization or individual that modifies OEM vehicl es after first use or sale to operate on a different fuel (or fuels). AFUDC: Allowance for Funds Used During Construction AFV: Alternative-Fuel Vehicle AGA: American Gas Association Agglomerating character: Agglomeration describes the caking properties of coal. A gglomerating character is determined by examination and testing of the residue when a small powdered sample is heated to 950 degrees Centigrade underspecific conditions. If the sample is "agglomerating," the residue will be coherent, show swelling or cell structure, and be capable of supporting a 500-gram weight without pulverizing. Aggregate ratio: The ratio of two population aggregates (totals). Fo r example, the aggregate expenditures per household is t he ratio of the total expenditures in each category to the total number of households in the category. Aggregator: Any marketer, broker, public agency, city, county, or spe cial district that combines the loads of multiple end-use customers in negotiating the purchase of electricity, the transmission of electricity, and other related services for these customers. Agriculture: An energy-consuming subsector of the industrial sector that consists of all facilities and equipment engaged in gro wing crops and raising animals. Agriculture, mining, and construction (consumer cat egory): Companies engaged in agriculture, mining (other tha n coal mining), or construction industries. Air cleaner: A device using filters or electrostatic precipitators to r emove indoor-air pollutants such as tobacco smoke, dust, and pollen. Most portable units are 40 watts when operated on low speed and 100 watts on high speed. Air collector: A medium-temperature collector used predominantly in space heating, utilizing pumped air as the heat-transfer medium. Air conditioning: Cooling and dehumidifying the air in an enclosed spaceby use of a refrigeration unit powered by electricity or natural gas. Note: Fans, blowers, and evaporative coolin g systems ("swamp coolers") that are not connected to a ref rigeration unit are excluded. Air conditioning intensity: The ratio of air-conditioning consumption or expendit ures to square footage of cooled floor space and cooling degree-days (base 65 degrees F). This intensity pro vides a way of comparing different types of housing units a nd households by controlling for differences in housing unit size and we ather conditions. The square footage of cooled floor spa ce is equal to the product of the total square footage times the ratio ofthe number of rooms that could be cooled to the tota l number of rooms. If the entire housing unit is cooled, the cooled floor space is t he same as the total floor space. The ratio is calculate d on a weighted, aggregate basis according to this formula: Air-Condition ing Intensity = Btu for Air Conditioning/(Cooled Squa reFeet * Cooling Degree-Days) Air pollution abatement equipment: Equipment used to reduce or eliminate airborne poll utants, including particulate matter (dust, smoke, fly, ash, dirt, etc.), sulfur oxides,nitrogen oxides (NOx), carbon monoxide, hydrocarbons, odors, and other pol lutants. Examples of air pollution abatement structures and equip ment include flue-gas particulate collectors, flue-gas desu lfurization units and nitrogen oxide control devices. 

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3 of 9 8/31/2015 8:46 AMAlcohol: The family name of a group of organic chemical compoun ds composed of carbon, hydrogen, and oxygen. The series of

molecules vary in chain length and are composed of a hydroca rbon plus a hydroxyl group; CH(3)-(CH(2))n-OH (e.g., me thanol, ethanol, and tertiary butyl alcohol). Alkylate: The product of an alkylation reaction. It usually refers to the high-octane product from alkylation units. This a lkylate is used in blending high octane gasoline. Alkylation: A refining process for chemically combining isobutane wit h olefin hydrocarbons (e.g., propylene, butylene) throug h the control of temperature and pressure in the presence of a nacid catalyst, usually sulfuric acid or hydrofluoric acid. Theproduct alkylate, an isoparaffin, has high octane value and is blended wit h motor and aviation gasoline to improve the antiknock va lue of the fuel. All-electric home: A residence in which electricity is used for the main sou rce of energy for space heating, water heating, and cooking. Other fuels may be used for supplementary heating or other purposes. Alternate energy source for primary heater: The fuel that would be used in place of the usual m ain heating fuel if the building had to switch fuels. (See Fuel-Switching Capability.) Alternating current (AC): An electric current that reverses its direction at regula rly recurring intervals. Alternative fuel: Alternative fuels, for transportation applications, in clude the following: methanol denatured ethanol, and other alcohols fuel mixtures containing 85 percent or more by volume of methanol, denatured ethanol, and other alcohols with gasoline or other fuels natural gas liquefied petroleum gas (propane) hydrogen coal-derived liquid fuels fuels (other than alcohol) derived from biological mate rials (biofuels such as soy diesel fuel) electricity (including electricity from solar energy) 

### "... any other fuel the Secretary determines, by rule, i s substantially not petroleum and would yield substantial energy security benefits and substantial environmental benefits." The te rm "alternative fuel" does not include alcohol or otherblended portions of primarily petroleum-based fuels used as oxygenates or ext enders, i.e. MTBE, ETBE, other ethers, and the 10-per cent ethanol portion of gasohol. Alternative fuel vehicle converter: An organization (including companies, government agenci es and utilities), or individual that performs conversions involving alternative fuel vehicles. An A FV converter can convert (1) conventionally fueled vehicles toAFVs, (2) AFVs to conventionally fueled vehicles, or (3) AFVs to use another alternative fuel. Alternative-fuel vehicle (AFV): A vehicle designed to operate on an alternative fuel (e.g., compressed natural gas, methane blend, electricity). The vehicle could be either a dedicated vehicl e designed to operate exclusively on alternative fuel or a nondedicated vehicle designed to operate on alternative fuel and/ora traditional fuel. Alternative-rate DSM program assistance: A DSM (demand-side management) program assistance thatoffers special rate structures or discounts on the consumer's monthly electric bill in exchange for participation in DSM programs aimed atcutting peak demands or changing load shape. These rates are intended to reduce consumer bills and shift hours of operation ofequipment from on-peak to off-peak periods through the application of time-differentiated rates. For example, utilities ofte n pay consumers several dollars a month (refund on their monthly electric bill) for participation in a load control program. Large co mmercial and industrial customers sometimes obtain interruptible rates, which provi de a discount in return for the consumer's agreement to cut electric loads upon request from the utility (usually during critical pe riods, such as summer afternoons when the system demand app roaches the utility's generating capability). 

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4 of 9 8/31/2015 8:46 AMAmerican Indian Coal Lease: A lease granted to a mining company to produce coal from land held in trust by the United States for

Native Americans, Native American tribes, and Alaska Natives in exchange for royalties and other revenues. AMI: Advanced Metering Infrastructure is a term denoting el ectricity meters that measure and record usage data at a m inimum, in hourly intervals, and provide usage data to both consumers and energy companies at least once daily. Amorphous silicon: An alloy of silica and hydrogen, with a disordered, no ncrystalline internal atomic arrangement, that can be deposited in thin-film layers (a few micrometers in thickn ess) by a number of deposition methods to produce thin-fi lm photovoltaic cells on glass, metal, or plastic substrates. Amortization: The depreciation, depletion, or charge-off to expenseof intangible and tangible assets over a period of tim e. In the extractive industries, the term is most frequently applied to mean either (1) the periodic charge-off to expense of the costs associated with non-producing mineral properties incurred prior to the time when they are developed and entered into production or (2) the systematic charge-off to expense of those costs of productive m ineral properties (including tangible and intangible costs of prospecting, acquisition, exploration, and development) that had been initially capitalized (or deferred) prio r to the time the properties entered into production, and thereafter are charged o ff as minerals are produced. Ampere: The unit of measurement of electrical current produced in a circuit by 1 volt acting through a resistance of 1 Oh m. AMR: Automated Meter Reading is a term denoting electrici ty meters that collect data for billing purposes only and transmit this data one way, usually from the customer to the distribution u tility. Anaerobic decomposition: Decomposition in the absence of oxygen, as in an anaerob ic lagoon or digester, which produces CO2 and CH4. Anaerobic lagoon: A liquid-based organic waste management installation characterized by waste residing in water at a depth of at least 6 feet for periods of 30 to 200 days. Ancillary services: Services that ensure reliability and support the transmi ssion of electricity from generation sites to customer loads. Such services may include load regulation, spinning r eserve, non-spinning reserve, replacement reserve, and volta ge support. Annual operating factor: The annual fuel consumption divided by the product of design firing rate and hours of operation per year. Annual requirement: The reporting company's best estimate of the annual re quirement for natural gas to make direct sales or sales for resale under certificate authorizations and for comp any useand unaccounted-for gas during the year next follow ing the current report year. ANSI: American National Standards Institute ANSI assembly identifier: The serial numbering scheme adopted by the American National Standards Institute (ANSI) to ensure uniqueness of an assembly serial number. Anthracite: The highest rank of coal; used primarily for residentia l and commercial space heating. It is a hard, brittle, a nd black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentageof volatile matter. The moisture content of fresh-mined anthracite generally is less than 15 percent. The heat content of anthracite ra nges from 22 to 28 million Btu per ton on a moist, mineral-matter-free basis. The heat content of anthracite coal consumed in th e United States averages 25 million Btu per ton, on the as-received basis (i.e., containing both inherent moisture and mineral matter ). Note: Since the 1980's, anthracite refuse or mine waste has been used for steam e lectric power generation. This fuel typically has a heat co ntent of 15 million Btu per ton or less. Anthropogenic: Made or generated by a human or caused by human activity. The term is used in the context of global climate change to refer to gaseous emissions that are the result o f human activities, as well as other potentially climate- altering activities, such as deforestation. API: The American Petroleum Institute, a trade association. 

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5 of 9 8/31/2015 8:46 AMAPI gravity: American Petroleum Institute measure of specific gravity of crude oil or condensate in degrees. An arbitrary scale expressing the gravity or density of liquid petroleum pro ducts. The measuring scale is calibrated in terms of degree s API; it is calculated as follows: 

### Degrees API = (141.5 / sp.gr.60 deg.F/60 deg.F) - 131 .5 Apparent consumption, (coal): Coal production plus imports of coal, coke, and briquet s minus exports of coal, coke, and briquets plus or minus stock changes. Note: The sum of "Production" a nd "Imports" less "Exports" may not equal "Consumption" du e to changes in stocks, losses, unaccounted-for coal, and special arra ngements such as the United States shipments of anthracite to United States Armed Forces in Europe. Apparent consumption, natural gas (international): The total of an individual nation's dry natural gas p roduction plus imports less exports. Apparent consumption, petroleum (international): Consumption that includes internal consumption, refine ry fuel and loss, and bunkering. For countries in the Organization for Economi c Cooperation and Development (OECD), apparent consumpt ion is derived from refined product output plus refined product imports minus refined product exports plus refined product stock changes plus other oil consumption (such as direct use of crude oil). For count ries outside the OECD, apparent consumption is either areported figure or is derived from refined product output plus refined pro duct imports minus refined product exports, with stock levels assumed to remain the same. Apparent consumption also includes, wher e available, liquefied petroleum gases sold directly from natural gas processing plants for fuel or chemical uses. Apparent power: The product of the voltage (in volts) and the current (in amperes). It comprises both active and reactive power. It is measured in "volt-amperes" and often expressed in "kilovolt -amperes" (kVA) or "megavolt-amperes" (MVA). See Power, Reactive Power, Real Power

. Appliance: A piece of equipment, commonly powered by electricity, used to perform a particular energy-driven function. Exam ples of common appliances are refrigerators, clothes washers and di shwashers, conventional ranges/ovens and microwave ovens, humidifiers and dehumidifiers, toasters, radios, and tel evisions. Note: Appliances are ordinarily self-contained wi th respect to their function. Thus, equipment such as central heating and airconditioning systems and water heaters, which are connected to distribution systems inherent to their purposes, are not co nsidered appliances. Appliance efficiency index: A relative comparison of trends in new-model efficienci es for major appliances and energy-using equipment. The base year for relative comparisons was 1972 (1972=100). Efficiencies for each year were efficiencies ofdifferent model types that were weighted by their market shares. Appliance efficiency standards: The National Appliance Energy Conservation Act of 1987established minimum efficiency standards for major home appliances, including furnaces, ce ntral and room air conditioners, refrigerators, freezers, water heaters, dishwashers, and heat pumps. Most of the standards took eff ect in 1990.The standards for clothes washers, dishwashers, a nd ranges took effectin 1988, because they required only minor chang es in product design, such as eliminating pilot lights and requiring cold water rinse options.The standards for central air condit ioners and furnaces took effect in1992, because it took lon ger to redesign these products. Appliance efficiency standards for refrigerators took effect in 1993. ARA: Amsterdam-Rotterdam-Antwerp Arbitrage: The simultaneous purchase and sale of identical or simil ar assets across two or more markets in order to profit fro m a temporary price discrepancy. Aromatics: Hydrocarbons characterized by unsaturated ring structures ofcarbon atoms. Commercial petroleum aromatics are benzene, toluene, and xylene (BTX). As received coal: Coal in the condition as received by the user. As-received condition or as-received basis (coal): Coal in the condition as received by the consumer or the laboratory analyzing 

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6 of 9 8/31/2015 8:46 AMthe coal. Asbestos: A group of naturally occurring minerals that separate into long, thin fibers. Asbestos was used for many years to insulate and fireproof buildings. In the 1989 CBECS, informat ion on asbestos in buildings was collected (Section R of t he Buildings Questionnaire) for the U.S. Environmental Protection A gency (EPA). Asbestos treatment methods include removal, en capsulation or sealing, and enclosure behind a permanent barrier. Ash: Impurities consisting of silica, iron, alumina, and oth er noncombustible matter that are contained in coal. Ash increases the weight of coal, adds to the cost of handling, and can affect its burning characteristics Ash content is measured as a p ercent by weight of coal on an "as received" or a "dry" (moisture-free, usu ally part of a laboratory analysis) basis. Asphalt: A dark brown-to-black cement-like material obtained by petroleum processing and containing bitumens as the pre dominant component; used primarily for road construction. It includ es crude asphalt as well as the following finished product s: cements, fluxes, the asphalt content of emulsions (exclusive of water), and petroleum distillates blended with asphalt to make cutb ack asphalts. Note: The conversion factor for asphalt is 5.5 barrels per short ton. Asphalt (refined): See Asphalt

. Assembly identifier: A unique string of alphanumeric characters that identi fies an assembly, bundle, or canister for aspecific reactor in which it has been irradiated. Assembly type: Each assembly is characterized by a fabricator, rod-array size , and model type. An eight-digit assembly type code is assigned to each assembly type based on certain distinguishing characteristics, such as the number of rods per assembly, fu el roddiameter, cladding type, materials used in fabricatio n, and other design features. Assessment work: The annual or biennial work performed on a mining claim (or claims), after claim location and before paten t, to benefit or develop the claim and to protect it from re location by third parties. Assistance for heating in winter: Assistance from the Low-Income Home Energy Assistance Progr am (LIHEAP). The purpose of LIHEAP is to assist eligible households to meet the costs of home energy, i.e., a source of heating or cooling r esidential buildings. Assistance for weatherization of residence: The household received services free, or at a reduced cost, from the Federal, State, or local Government. Any of the following services could have been received: * Insulation in the attic, outside wall , or basement/crawlspace below the floor of the house * Insul ation around the hot water heater * Repair of broken windows or doors to keep out the cold or hot weather * Weather stripping o r caulking around any windows or doors to the outside * S torm doors or windows added * Repair of broken furnace * Furnace tune -up and/or modifications * Other home energy-saving devi ces. Associated natural gas: See Associated-dissolved natural gasand Natural gas

. Associated-dissolved natural gas: Natural gas that occurs in crude oil reservoirs either as free gas (associated) or as gas in solution with crude oil (dissolved gas). Also see Natural gas

. ASTM: American Society for Testing and Materials
at wt: The abbreviation for atomic weight. Atmospheric crude oil distillation: The refining process of separating crude oil components at atmospheric pressure by heating to temperatures of about 600 degrees to 750 degrees Fahre nheit (depending on the nature of the crude oil and desired products) and subsequent condensing of the fractions by cooling. Auger mine: A surface mine in which the coal bed is removed by mean s of a large diameter drill. Usually operated only when the overburden becomes too thick for economical strip mining. Authorized cash distribution to municipality: The authorized cash distributions to the municipality fr om the earned surplus of the utility department. 

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7 of 9 8/31/2015 8:46 AMAutomatic set-back or clock thermostat: A thermostat that can be set to turn the heating/cool ing system off and on at certain

predetermined times. Automobile and truck classifications: Vehicle classifications for automobiles and light duty tr ucks were obtained from the EPA (Environmental Protection Agency) mileage guide book. Al most every year there are small changes in the classification s, therefore the categories will change accordingly. The EPA mileage guide can be found at any new car dealership. Auxiliary generator: A generator at the electric plant site that provides p ower for the operation of the electrical generating equipment itself, including related demands such as plantlighting, during periods when the electric plant is no t operating and power is unavailable from the grid. A black start generator used to start main central station generators is considered to be an auxiliary generator. Available but not needed capability: Net capability of main generating units that are ope rable but not considered necessary to carry load and cannot be connected to load within 30 min utes. Average Annual Percent Change (Coal): The average annual percent change over a period of seve ral years that is calculated by taking the nth root [where n is the number of years in the period of interest] of the result of the current ye ar's value divided by the value of the first year of the period; this result then has 1 (one) subtracted from it and that result is then multiplied by 100. Where V0 = the value for the base period. Vn= the value for the n th period. n = the number of periods. Average daily production: The ratio of the total production at a mining oper ation to the total number of production days worked at the operation. Average delivered price: The weighted average of all contract price commitments and market price settlements in a delivery year. Average household energy expenditures: A ratio estimate defined as the total household energy expenditures divided by the total number of households. Average mine price: The ratio of the total value of the coal produced atthe mine to the total production tonnage. Average Number of Employees (coal): The average number of employees working in a specific yea r at coal mines and preparation plants. Includes maintenance, office, as well as production -related employees. Average Open Market Sales Price (coal): The ratio, for a specified time period, of the tota l value of the open market sales of coal produced at the mine to the value of the total open m arket sales tonnage. Average production per miner per day: The product of the average production per miner per hour at a mining operation and the average length of a production shift at the operation. Average production per miner per hour: The ratio of the total production at a mining ope ration to the total direct labor hours worked at the operation. Average Recovery Percentage (coal): The percentage of coal that can be recovered from known coal reserves at reporting mines, weight averaged for all mines in the reported geograp hic area. Average revenue per kilowatthour: The average revenue per kilowatthour of electricity sold by sector (residential, commercial, industrial, or other) and geographic area (State, Cen sus division, and national) is calculated by dividing the to tal monthly revenue by the corresponding total monthly sales for each sector and g eographic area. Average stream flow: The rate, usually expressed in cubic feet per second, at w hich water passes a given point in a stream over a set period of time. 

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8 of 9 8/31/2015 8:46 AMAverage vehicle fuel consumption: A ratio estimate defined as total gallons of fuel con sumed by all vehicles divided by (1) the total

number of vehicles (for average fuel consumption per vehicl e) or (2) the total number of households (for average fuel consumption per household). Average vehicle miles traveled: A ratio estimate defined as total miles traveled by al l vehicles, divided by: (1) the total number of vehicles (for average miles traveled per vehicle) or (2) th e total number of households (for average miles traveled per household). Average water conditions: The amount and distribution of precipitation within a drainage basin and the run off conditions present as determined by reviewing the area water supply records overa long period of time. Aviation gasoline (finished): A complex mixture of relatively volatile hydrocarbons with or without small quantities of additives, blended to form a fuel suitable for use in aviation re ciprocating engines. Fuel specifications are provided in AS TM Specification D 910 and Military Specification MIL-G-5572. Note: Data on b lending components are not counted in data on finished aviation gasoline. Aviation gasoline blending components:: Naphthas that will be used for blending or compoundi ng into finished aviation gasoline (e.g., straight run gasoline, alkylate, reformate,benzen e, toluene, and xylene). Excludes oxygenates (alcohols, ethers), butane, and pentanes plus. Oxygenates are reported as other hydrocarbon s, hydrogen, and oxygenates. 

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