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