# Planck's constant

## Planck's constant

*noun*\ˈpläŋ(k)s-, ˈplaŋ(k)s-\

## Definition of *PLANCK'S CONSTANT*

**:**a constant that gives the unvarying ratio of the energy of a quantum of radiation to its frequency and that has an approximate value of 6.626 × 10

^{−34}J·s —symbol

*h*

## Origin of *PLANCK'S CONSTANT*

Max K. E. L.

*Planck*First Known Use: 1910

## Planck's constant

*noun*\ˈplaŋ(k)s-, ˈpläŋ(k)s-\

*(Medical Dictionary)*

## Medical Definition of *PLANCK'S CONSTANT *

**:**a constant that gives the unvarying ratio of the energy of a quantum of radiation to its frequency and that has an approximate value of 6.626 × 10

^{−34}joule second—symbol

*h*

## Biographical Note for *PLANCK'S CONSTANT *

**Planck**\ˈpläŋk\

**Max Karl Ernst Ludwig**

**(1858–1947),**German physicist. Planck is credited with originating the quantum theory in physics. Throughout his career he taught theoretical physics at a succession of German universities. In 1900 he introduced Planck's constant as a part of his accurate formulation of the distribution of the radiation emitted by a blackbody, which is a perfect absorber of radiant energy. His discoveries established the field of quantum physics. Planck is also remembered for his work relating to thermodynamics and mechanics and to electrical and optical problems associated with radiation of heat and with the quantum theory. He was awarded the Nobel Prize for Physics in 1918.

## Learn More About *PLANCK'S CONSTANT *

## Browse

Next Word in the Dictionary: planctonic

Previous Word in the Dictionary: Planck radiation law

All Words Near: Planck's constant

Previous Word in the Dictionary: Planck radiation law

All Words Near: Planck's constant

## Seen & Heard

What made you want to look up *Planck's constant*? Please tell us where you read or heard it (including the quote, if possible).