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A variable that doesn’t change when other variables are altered is known as:
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Constant.
A "constant" is a variable that remains constant when other variables are changed. Within the domains of mathematics and science, a constant refers to a value that is fixed and does not change.
It stands in contrast to variables, which are subject to change and assume distinct values in reaction to modifications in other factors or circumstances. When describing parameters or quantities that are supposed to stay constant in a particular scenario or model, constants are frequently used.