< 1 >
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 1.380 649 × 10−23 J K−1.
Example 4
By definition, Planck's constant h has the value 6,626 070 15 × 10−34 J s.