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| Planck's constant; quantum of action | |||
| Planck’s constant | |||
| Planck constant (Planck's unit/Planck's element of action) | |||
| Planck's constant; Planck quantum; Planck's quantum; elementary quantum of action | |||
| Planck constant | |||
| Plancksches Wirkungsquantum: 1 phrase in 1 subject |
| Chemistry | 1 |