# Definition:Reduced Planck Constant

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## Definition

The **reduced Planck constant** is the physical constant $\hbar$ which is derived from Planck's constant by dividing it by $2 \pi$:

- $\hbar = \dfrac h {2 \pi}$

### Value

\(\ds \hbar\) | \(=\) | \(\ds 1 \cdotp 05457 \, 1817 \ldots \times 10^{-34} \, \mathrm {J \, s}\) | This sequence is A254181 in the On-Line Encyclopedia of Integer Sequences (N. J. A. Sloane (Ed.), 2008). | |||||||||||

\(\ds \) | \(=\) | \(\ds 1 \cdotp 05457 \, 1817 \ldots \times 10^{-27} \, \mathrm {erg \, s}\) |

### Symbol

- $\hbar$

The symbol for the **reduced Planck constant** is $\hbar$.

The $\LaTeX$ code for \(\hbar\) is `\hbar`

.

## Also known as

The reduced Planck constant can also be seen referred to as:

## Also see

## Source of Name

This entry was named for Max Karl Ernst Ludwig Planck.

## Sources

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