### fluorescence:

Phosphorescence
* are fluorescence.
* is fluorescence
  - much more efficient in terms of energy consumption
* is the ability of a mineral to glow after the initial light is removed
  - emission of light after the irradiation period
  - light continuing to be emitted after the external stimulus ceases
* means to the ability to glow after being exposed to light.
* serves as a valuable tool in the scientific examination of various materials.
* sparkles in the droplets of water that fall from our paddles.
* typically has a shorter lifetime than fluorescence.

Fluorine compound
* have excellent properties typified by high durability
  - many uses
+ Fluorine, Uses: Nonmetals :: Halogens
  * Fluorine is used to enrich uranium for nuclear weapons. It is also used to make sulfur hexafluoride. Sulfur hexafluoride is used to propel stuff out of an aerosol can. It is also used to make integrated circuits. Fluorine compounds have many uses. Fluoride ions are in fluorine compounds. Fluoride ions can be in toothpaste. Some are used in nonstick coatings. Freons contain fluorine.

### foamy mixture:

Sabayon
* foamy mixture.
* is dessert
  - made of wine, sugar, and egg yolks

### focal:

Renal infection
* Some renal infection occurs in dogs
  - immunize dogs
* decreases ability to concentrate.
* develop in the medulla.
* is focal.

Foil
* All foils are subject to oxidation, although most only under elevated temperatures.
* Most foil has low mass
  - thickness
* acts as reflectors.
* are inkjet printable on foil side only
  - soft kites that have no hard frame and are controlled with two or four lines
* contains fluquinconazole and prochloraz.
* holds in heat, flavor and moisture
  - natural liquids, and foods cook moist and tender
* includes sections.
* is attention
  - metal
  - sheet metal
  - sheets
  - sports equipment
  - swords
  - used to add highlights and contrast to a design
* keeps food odors from transferring to other foods
  - odors of foods from transferring to one another
* process that is effective as a last resort.
* provide excellent barrier properties and are used for many packaging applications.
* reflects rays.
* shows diffraction effects
* type of sheet metal, foil can mean thwart, and a foil sword.
* use light diffraction to create effects that look different from various points.
* very thin metallic colored layer on cellophane.

### foil | chaff:

Black chaff
* bacterial disease that affects the glumes of developing wheat heads
  - infection of the glumes
* is rare in Kansas
  - the only other disease that often causes awn banding like glume blotch

Gold foil
* is foil
  - very, very thin
* type of foil which is gold coloured and stops heat from going anywhere.
+ Formula One car, Materials, Gold foil
  * Gold foil is a type of foil which is gold coloured and stops heat from going anywhere. It is used between the engine and fuel tank. It is used in that certain position so it can stop heat transfer from the engine to the fuel tank.

Reflective foil
* helps shield sensitive scalp.
* requires an airspace next to the shiny surface to act as an insulator.

### folk dancing:

Country dance
* are folk dancing.
* have simple steps, and dancers move in geometric patterns.

### folk music:

Bluegrass
* are country music
  - genres of music
  - grass
* grows best in cool weather
  - full sun on well drained soils
* grows rapidly during cool, moist weather, with slower growth during hot, dry weather
  - in early spring, while trefoil starts some time later
* is folk music
  - usually the most effective pasture species across all classes of horses
* produces thatch quickly, while tall fescue produces little or none.
* require medium amounts of lawn care and make beautiful home and sports grasses.