Quantity

Symbol    

Value

Unit

speed of light in vacuum

c; c₀

299792458

m/s

acceleration due to gravity

g

9.80665

m/s²

Planck constant

h

6.6260687652 x 10^-34

J.s

Avogadro constant

N_A; L

6.0221419947 x 10²³

mol^-1

atomic mass constant

  m_u = 1/12 m(¹²C) = 1 u

m_u

1.6605387313 x 10^-27

kg

  energy equivalent

m_uc²

1.4924177812 x 10^-10

J

Faraday constant

F

96485.341539

C/mol

molar Planck constant

N_Ah

3.99031268930 x 10^-10

J.s/mol

N_Ahc

0.1196265649291

J.m/mol

molar gas constant

R

8.314472

J/(mol.K)

Boltzmann constant

k

1.380650324 x 10^-23

J/K

molar volume of ideal gas RT/p

V_m

  T = 273.15 K; p = 101.325 kPa

22.41399639 x 10-3

m³/mol

  T = 273.15 K; p = 100 kPa

22.71098140 x 10^-3

m³/mol

Loschmidt constant

n₀

2.686777547 x 10²⁵

m^-3

Sackur-Tetrode constant
(absolute entropy constant)

S₀/R

  T1 = 1 K; p₀ = 101.325 kPa

- 1.164867844

  T1 = 1 K; p₀ = 100 kPa

- 1.151704844

Stefan-Boltzmann constant

σ

5.67040040 x 10^-8

W/(m².K⁴)

first radiation constant

c₁

3.7417710729 x 10^-16

W.m²

second radiation constant

c₂

1.438775225 x 10^-2

m.K