I am specifically interested in the following constants because being a student these are some of the most common constants that I face:
- $R$ (universal gas constant)
- Stefan constant
- Permeability of free space
- $G$ (universal gravitational constants)
Starting from 2019, scientists have redefined the units of fundamental quantities. The definition of kilogram, kelvin and ampere have been changed. In the new system, Planck's constant $h$, Boltzmann's Constant $k$, Avogadro's Number $N_A$, speed of light $c$, and charge on an electron $e$ are given constant fixed values. So the definition of kilogram, kelvin and ampere is given in terms of definition of metre,sec,mole and these fundamental constants. How will this affect the constant values that we have used since such a long time? I have mentioned just a few constants only to just get a brief idea about the effect of this redefinition.