Constants aren't so constant [SOLVED]

[Krauts In Space]

(12-03-2016 04:14 PM)JMB Wrote:  The physical constants that can be accessed in the Prime, fall mainly into two categories: constants with an exact value (like "c" - the speed oh light), and constants whose values depend on the current state of the art measurements (like "G" - the gravitation constant).

But even constant speed of light isn't as constant since it depends on the medium it travels.
In water (I suppose 20° celsius) it's 225 e6 m/s, in glass it's 160 e6 m/s.