The reduced Planck constant is the " quantum of action ".
2.
For this reason, Planck's constant was often called the " quantum of action ".
3.
Plaque at the Humboldt University of Berlin : " Max Planck, discoverer of the elementary quantum of action " h ", taught in this building from 1889 to 1928 ."
4.
This reflects the fact that " on a scale adapted to humans ", where energies are typically of the order of kilojoules and times are typically of the order of seconds or minutes, the Planck constant ( the quantum of action ) is very small.
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