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Physical constants formulas
24 formulas for Physical constants, from the Physics — Units, Dimensions & Constants section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Speed of light in vacuum | c = 2.998 × 10⁸ m/s | |
| Gravitational constant | G = 6.674 × 10⁻¹¹ N·m²/kg² | |
| Acceleration due to gravity | g = 9.8 m/s² (standard 9.80665) | at Earth's surface |
| Planck constant | h = 6.626 × 10⁻³⁴ J·s | |
| Reduced Planck constant | ħ = h/2π = 1.055 × 10⁻³⁴ J·s | |
| Elementary charge | e = 1.602 × 10⁻¹⁹ C | |
| Electron mass | mₑ = 9.109 × 10⁻³¹ kg | |
| Proton mass | mₚ = 1.673 × 10⁻²⁷ kg | |
| Neutron mass | mₙ = 1.675 × 10⁻²⁷ kg | |
| Avogadro number | N_A = 6.022 × 10²³ mol⁻¹ | |
| Boltzmann constant | k = 1.381 × 10⁻²³ J/K | |
| Universal gas constant | R = 8.314 J/(mol·K) | |
| Permittivity of free space | ε₀ = 8.854 × 10⁻¹² F/m | |
| Coulomb constant | 1/(4πε₀) = 8.988 × 10⁹ N·m²/C² | |
| Permeability of free space | μ₀ = 4π × 10⁻⁷ H/m | |
| Stefan–Boltzmann constant | σ = 5.670 × 10⁻⁸ W/(m²·K⁴) | |
| Wien's constant | b = 2.898 × 10⁻³ m·K | |
| Rydberg constant | R∞ = 1.097 × 10⁷ m⁻¹ | |
| Bohr radius | a₀ = 5.29 × 10⁻¹¹ m | |
| Faraday constant | F = 96 485 C/mol | |
| Earth — mass / radius | 5.97 × 10²⁴ kg / 6.37 × 10⁶ m | |
| Speed of sound in air (20 °C) | ≈ 343 m/s | |
| Standard atmosphere | 1.013 × 10⁵ Pa | |
| Absolute zero | 0 K = −273.15 °C |
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