Absolute zero
-273.16 °C
Acceleration of free fall, standard
9.80665 m/s
2
Avogadro constant
6.0221367×10
23
1/mol
Base of natural logarithms
2.718281828
Bohr magneton
9.2740154×10
-24
J/T
Bohr radius
5.29177249×10
-11
m
Boltzmann constant
1.380658×10
-23
J/K
Classical electron radius
2.81794092×10
-15
m
Dirac's constant
1.0545887×10
-34
J s
Elementary charge
1.60217733×10
-19
C
Electron mass
9.1093897×10
-31
kg
Electron-proton mass ratio
5.44617013×10
-4
Electronvolt
1.6021892×10
-19
J
Faraday constant
96485.309 C/mol
Feigenbaum's constant
4.669210609102990
Fine-structure constant
7.29735308×10
-3
First radiation constant
3.7417749×10
-16
W m
2
Newtonian constant of gravitation
6.67259×10
-11
N m
2
/kg
2
Hydrogen Rydberg number
1.0967758×10
7
1/m
Josephson frequency-voltage quotient
4.8359767×10
14
Hz/V
Loschmidt constant (T=273.15 K, p=100 kPa)
2.686763×10
25
1/m
3
Magnetic flux quantum
2.06783461×10
-15
Wb
Molar gas constant
8.314510 J/mol K
Molar Planck constant
3.99031323×10
-10
J s/mol
Molar volume (Ideal Gas, T=273.15 K, p=101.325 kPa)
0.02241410 m
3
/mol
Standard pressure
101325 Pa
Nuclear magneton
5.0507866×10
-27
J/T
Permeability of vacuum
12.566370614×10
-7
N/A
2
Permittivity of vacuum
8.854187817×10
-12
F/m
PI
3.1415926535897932
Planck constants
6.6260755×10
-34
J s
Rydberg constant
10973731.534 1/m
Second radiation constant
0.01438769 m K
Solar constant
1400 W/m
2
Speed of light in vacuum
299792458 m/s
Speed of sound in air at STP
340 m/s
Stefan-Boltzmann constant
5.67051×10
-8
W/m
2
K
4