Here are some funamental constants, in SI units.
ε0 8.8854*10-12 farad metre-1 Permittivity of free space.
μ0 4π*10-7 henry metre-1 Permeability of free space.
c 2.998*108 m/s Velocity of light.
h 6.626*10-34 joule sec Plank's constant.
e 1.602*10-19 coulomb Charge of electron.
k 1..381*10-23 joule/K Boltzmann's constant.
me 9.110*10-31 kgram Mass of electron .