| 单词 | mean free path |
| 释义 | > as lemmasmean free path mean free path n. Physics the mean value of a free path; esp. the mean value of the distance travelled by a particle before collision with another particle or with a bounding surface. ΘΚΠ the world > matter > physics > atomic physics > particle physics > particle avoiding strong interaction > electron > [noun] > unimpeded path in crystal mean free path1879 the world > matter > physics > atomic nucleus > nuclear fission > nuclear fuel > [noun] > source of thermal neutrons > distance travelled by neutron mean free path1879 1879 Eng. Mech. 5 Sept. 639/1 This dark space is found to increase and diminish as the vacuum is varied, and is found to be the mean free path of the molecules of the residual gas. 1933 A. W. Barton Text Bk. Heat ix. 208 The viscosity is independent of pressure. The same argument applies to thermal conductivity. Both of these predictions have been verified experimentally for pressures at which the mean free path is small compared to the size of the containing vessel. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VIII. 187 The types of mean free paths which are used most frequently are for elastic collisions of molecules in a gas, of electrons in a crystal, of phonons in a crystal, and of neutrons in a moderator. 1985 Aerosol Sci. & Technol. 4 269/2 The assumed mean free path of 0.0673 μm for air at sea level and 23°C with viscosity of 183.245 micropoise. < as lemmas |
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