Planck's constant

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Noun[change]

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}