Avagadro s Number ( N _A)

6.0221 10 ²⁶ kmol ^{? 1}

6.0221 10 ²³ mol ^?1

Boltzmann s Constant ( k)

1.3807 10 ^{? 23} J/K

1.3807 10 ^{? 16} erg/K

Universal Gas Constant ( R = N _A k)

8.3145 J/K mol

8.3145 10 ⁷ erg/K mol

Planck s Constant ( h)

6.6261 10 ^{? 34} J s

6.6261 10 ^{? 27} erg s

Speed of Light in Vacuum ( c)

2.9979 10 ⁸ m/s

2.9979 10 ¹⁰ cm/s

Atomic Mass Unit ( m _u)

1.6605 10 ^{? 27} kg

1.6605 10 ^{? 24} g

Electron Rest Mass ( m _e)

9.1094 10 ^{? 31} kg

9.1094 10 ^{? 28} g

Proton Rest Mass ( m _p)

1.6726 10 ^{? 27} kg

1.6726 10 ^{? 24} g

Electron Charge ( e)

1.6022 10 ^{? 19} C

1.6022 10 ^{? 19} C

Permittivity of Vacuum ( ? _?)

8.8542 10 ^{? 12} C ²/J m

8.8542 10 ^{? 21} C