\text{J}{\cdot}\text{s}

joule second

Angular momentumexact by definition

The joule second is exactly equal to the kilogram square metre per second, since a joule is kg·m²/s². The two are the same unit under different names, and the equality is exact. Quantum mechanics prefers this form because the Planck constant, whose fixed value is 6.62607015 × 10⁻³⁴ J·s, is itself an angular momentum.

Watch out: The reduced Planck constant $\hbar = h/2\pi$ is the natural quantum of angular momentum, and particle spins are quoted as multiples of it. A spin-1/2 particle has angular momentum $\hbar/2$ , about 5.27 × 10⁻³⁵ J·s. Do not mix $h$ and $\hbar$ , which differ by a factor of $2\pi$ .

\text{J}{\cdot}\text{s}

\text{kg}{\cdot}\text{m}^{2}\text{/s}

One joule second in every angular momentum unit

9.48252e+33	reduced Planck constant (hbar)
1.50919e+33	Planck constant (h)
10,000,000	gram square centimeter per second (g·cm²/s)
10,000,000	erg second (erg·s)
10,000	kilogram square centimeter per second (kg·cm²/s)
23.7304	pound square foot per second (lb·ft²/s)
1	kilogram square meter per second (kg·m²/s)
1	joule second (J·s)this unit
1	newton meter second (N·m·s)
0.737562	slug square foot per second (slug·ft²/s)

Solvers that use angular momentum

Angular Momentum (L = Iω)

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