| |||

## Planck Constants | ||
---|---|---|

## Characteristic | ## Planck-constant | ## Notes | ||
---|---|---|---|---|

## Symbol | h | |||

## Metric (SI) Equivalent | This equivalent and the one below are exact. | |||

## Another Metric (SI) Equivalent with More Basic Units | ||||

## Metric (SI) Dimensions | length2 × mass × time-1 |

## Characteristic | ## Planck-constant-over-2-pi | ## Notes | ||
---|---|---|---|---|

## Symbol | ħ |
Use "hbar" for our conversion calculators. | ||

## Other Names | natural-unit-of-action, atomic-unit-of-action, natural-unit-of-angular-momentum, atomic-unit-of-angular-momentum, reduced Planck constant | |||

## Metric (SI) Equivalent | ||||

## Another Metric (SI) Equivalent with More Basic Units | ||||

## Metric (SI) Dimensions | length2 × mass × time-1 | |||

## Description in Terms of Other Units and Constants | Planck-constant / (2 pi) |