# Definition:Planck's Constant

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## Definition

**Planck's constant** is the physical constant $h$ whose value is defined as:

- $h = 6 \cdotp 62607 \, 015 \times 10^{-34} \, \mathrm J \, \mathrm s$

where the units $\mathrm J \, \mathrm s$ are joule seconds.

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Physical quantities with the same dimension include angular momentum and action.

## Also known as

**Planck's constant** is also seen referred to as the **Planck constant**.

## Source of Name

This entry was named for Max Karl Ernst Ludwig Planck.