In math, an expression that can be assigned any set of values. Variables are written as symbols, such as x, y or z, representing unspecified quantities or members of a set.

In science, the term refers to a condition or parameter that may be manipulated, fixed, measured, or observed in the course of scientific research. There are usually three categories of variables in science experiments; control, independent (experimental) and dependent (response). For more information, see our module Experimentation in Scientific Research.

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