Physics reference

Physical Constants

Copy high-value constants with their source-preserved significant digits and units.

Constants catalog

Reference constants

12 constants found.

299,792,458 m/s

The defined speed of light in vacuum.

6.67430 × 10⁻¹¹ N·m²/kg²

Sets the strength of Newtonian gravitation.

6.626 070 15 × 10⁻³⁴ J·s

Relates photon energy to frequency.

ℏ

1.054 571 817 × 10⁻³⁴ J·s

The Planck constant divided by 2π.

1.602 176 634 × 10⁻¹⁹ C

Magnitude of the charge carried by a proton.

ε₀

8.854 187 818 8 × 10⁻¹² C²/(N·m²)

Vacuum permittivity in the source reference.

μ₀

1.256 637 061 27 × 10⁻⁶ T·m/A

Vacuum permeability in the source reference.

N_A

6.022 140 76 × 10²³ 1/mol

Number of specified entities per mole.

1.380 649 × 10⁻²³ J/K

Connects thermal energy to absolute temperature.

8.314 462 618 J/(mol·K)

Relates ideal-gas state variables per mole.

5.670 374 419 × 10⁻⁸ W/(m²·K⁴)

Used in ideal thermal-radiation power laws.

2897.771 955 μm·K

Relates blackbody peak wavelength to absolute temperature.