### physical entity:

Variable
* Many variables affect the population dynamics of growth
  - way that internal communication takes place within organizations
  - weather and climate
* Many variables can affect catfish growth, but throughout their range, temperature major factor
  - the cooking time of gas-grilled foods
* Many variables contribute to hypothermia including age, health, body size and duration of exposure
  - the development of hypothermia
  - determine the balance of nature
* Some variables change brightness slowly over periods of weeks or months.
* are a. magnitudes that are constant or fixed
  - an essential part in every programming language
  - characteristics that change from subject to subject in a study
  - expressions that return the value they represent
  - factors which alter the rate of a chemical or physical change
  - holes in data structures
  - identifiers starting with an uppercase
  - just abbreviations for complex expressions, as in mathematics
  - locations in memory in which values can be stored
  - multidimensional structures of information constructed from and subscripted by sets
  - names that the program associates with specific locations in memory
  - part of formulas
  - phenomena that change such as personality characteristics, condition or abilities
  - placeholders that range over individual objects
  - places in memory where data are temporarily stored
  - properties or attributes of units of analysis
  - quantities or characteristics being measured
  - sets whose elements are called values
  - software containers that hold a value
* are strings of characters that are used to represent other strings or numbers
  - that have corresponding values
  - symbols used to represent one or more numbers
  - things that change
  - words used to represent numbers
* can contain complex or real numbers, integers, strings of numbers, series, and matrices
  - represent integers, real numbers, constants, or functions
* defined in a function are local variables.
* do have location in time and space.
* is the set of variables occurring in Term.
* list of variables.
* look like atoms, except they begin with a capital letter or an underscore sign.
* measure attitudes concerning the role of the United States in the world.
* play a key role in the process of mathematizing a situation.
* provide the means by which scientists structure their observations.
* store the information and sets define the structure of variables.

### physical entity | variable:

Cataclysmic variable
* are the nearest X-ray sources.
* consist of a main sequence star orbiting a white dwarf.

Continuous variable
* change in intensity at the same time or covary.
* represent points along a scale, such as age, test score, or income.

Correlate
* are variables.
* species diversity with species richness and species evenness.

Demographic variable
* are important determinants of behavior.
* cover age, education, and sex.

Dependent variable
* is component of an experiment that changes due to the experimental variable
  - the amount they grow
* reveal the effects that independent variables have on behavior.

Environmental variable
* Many environmental variables affect the way international public relations is practiced.
* influence the length of each developmental stage.

Global variable
* Try to avoid global variables, other than constants.
* are variables in the global namespace.

Independent variable
* are conditions varied or altered by the experimenter
* is the amount of fertilizer.

Random variable
* describe selected features of elements of a sample space.
* have a variety of applications in statistical simulations.
* represent the possible outcomes of an event.
* x variable just like in algebra.