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- A variable is an attribute of a physical or an abstract system which may change its value while it is under observation. Examples include the height of a child, the temperature across a state, or the input to a function.
- Constants are real numbers or numerical values which are significantly interesting in some way. The term "constant" is used both for mathematical constants and for physical constants, but with quite different meanings.
- That which is permanent or invariable; A quantity that remains at a fixed value throughout a given discussion; Any property of an experiment …