A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
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Variables are symbols (like x or y) that is used in mathematical or logical expressions to represent a variable quantity.
It is also something that is likely to vary.
Every time the independent variables change, the dependent variables change.Dependent variables cannot change if the independent variables didn't change.
control variables: the things that are not changing.Independent variables: the things that you change.Dependent variables: the things that are changed due to the independent variable
to quantify the qualitative variables.
Variables change, constants do not.
both, variables can be anything