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A constant is a fixed value, that doesn't change in a calculation.



A mathematical constant has no dimension.


Example 1

The number π has the value 3,1415….


Example 2

Euler's number e is the nullary function f () = e and has the value 2,7182….


Example 3

The Boltzmann constant kB has the exact vakue 1,38064852 × 10−23 J/K.


Example 4

By definition, Planck's constant h has the value 6,62607015 × 10−34 J·s.


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