A constant can be expressed using multiple equivalent units like – SI, natural units, atomic mass unit, CGS units etc. Some physical constants are redefined by fixing the SI values. But this certainly increases the uncertainty in the value of physical constants. In an algebraic expression, a constant term is a term that does not contain any variables and has a fixed value. It is simply a number that stands alone in the expression. Constant definition: not changing or varying; uniform; regular; invariable.. See examples of CONSTANT used in a sentence. Constant Contact connects the dots with marketing advice and resources built for you

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