| 单词 | Mach number |
| 释义 | Mach number The ratio of the relative speeds of a fluid and a rigid body to the speed of sound in that fluid under the same conditions of temperature and pressure. If the Mach number exceeds 1 the fluid or body is moving at a supersonic speed . If the Mach number exceeds 5 it is said to be hypersonic . The number is named after Ernst Mach (1838–1916) |
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