| 单词 | fine-structure constant |
| 释义 | fine-structure constant [`fīn ´strǝk·chǝr `kän·stǝnt] PHYSICS A fundamental dimensionless constant, equal to 2π times the square of the electron charge in electrostatic units, divided by the product of the speed of light and Planck's constant; mathematically, it is equal to (7.29735308 ± 0.00000033) × 10-3, approximately 1/137. Also known as Sommerfeld fine-structure constant. |
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