Universal4 constants

Speed of Light in Vacuum

Universal

299,792,458

m/s

Exact by definition

299792458

Gravitational Constant

Universal

6.674 × 10⁻¹¹

N·m²/kg²

± 0.00015 × 10⁻¹¹ N·m²/kg²

6.674e-11

Planck Constant

Universal

6.626 070 15 × 10⁻³⁴

J·s

Exact by definition

6.62607015e-34

Reduced Planck Constant

Universal

1.054 571 817… × 10⁻³⁴

J·s

Exact by definition

1.054571817e-34

Electromagnetic4 constants

Elementary Charge

Electromagnetic

1.602 176 634 × 10⁻¹⁹

C

Exact by definition

1.602176634e-19

Coulomb Constant

Electromagnetic

8.988 × 10⁹

N·m²/C²

Exact by definition

8.988e9

Vacuum Permittivity

Electromagnetic

8.854 × 10⁻¹²

F/m

Exact by definition

8.854e-12

Vacuum Permeability

Electromagnetic

1.257 × 10⁻⁶

H/m

Exact by definition

1.257e-6

Atomic6 constants

Electron Mass

Atomic

9.109 × 10⁻³¹

kg

Exact by definition

9.109e-31

Proton Mass

Atomic

1.673 × 10⁻²⁷

kg

Exact by definition

1.673e-27

Neutron Mass

Atomic

1.675 × 10⁻²⁷

kg

Exact by definition

1.675e-27

Atomic Mass Unit

Atomic

1.661 × 10⁻²⁷

kg

Exact by definition

1.661e-27

Bohr Radius

Atomic

5.292 × 10⁻¹¹

m

Exact by definition

5.292e-11

Rydberg Constant

Atomic

1.097 × 10⁷

m⁻¹

Exact by definition

1.097e7

Thermodynamic4 constants

Boltzmann Constant

Thermodynamic

1.380 649 × 10⁻²³

J/K

Exact by definition

1.380649e-23

Molar Gas Constant

Thermodynamic

8.314 462 618…

J/(mol·K)

Exact by definition

8.314462618

Avogadro Constant

Thermodynamic

6.022 140 76 × 10²³

mol⁻¹

Exact by definition

6.02214076e23

Stefan-Boltzmann Constant

Thermodynamic

5.670 374 419… × 10⁻⁸

W/(m²·K⁴)

Exact by definition

5.670374419e-8

Earth6 constants

Standard Gravity

Earth

9.806 65

m/s²

Exact by definition

9.80665

Earth Mass

Earth

5.972 × 10²⁴

kg

Exact by definition

5.972e24

Earth Radius (mean)

Earth

6.371 × 10⁶

m

Exact by definition

6.371e6

Solar Mass

Earth

1.989 × 10³⁰

kg

Exact by definition

1.989e30

Astronomical Unit

Earth

1.496 × 10¹¹

m

Exact by definition

1.496e11

Light Year

Earth

9.461 × 10¹⁵

m

Exact by definition

9.461e15

Other3 constants

Standard Atmosphere

Other

101,325

Pa

Exact by definition

101325

Speed of Sound (air, 20°C)

Other

343

m/s

Exact by definition

Water Density (4°C)

Other

1000

kg/m³

Exact by definition