Planck's constant

Noun

Singular Planck's constant

Plural none

1. (uncountable) Planck's constant is a measure of the size of a quantum, or the smallest 'piece' of energy that exists. It has a value $h\approx 6.626\times 10^{-34}\ \mathrm {J} \cdot \mathrm {s}$$h\approx 6.626\times 10^{-34}\ \mathrm {J} \cdot \mathrm {s}$