| 单词 | polytropic index |
| 释义 | > as lemmaspolytropic index polytropic index n. Astronomy and Physics a parameter n in the exponent of the equation relating pressure to density for a polytrope. ΚΠ 1936 Sci. Monthly Nov. 392/2 The density distribution near the outside [of the star] has a polytropic index 3 which gradually diminishes to 1.5 at the center. 1954 J. L. Greenstein in L. N. Ridenour Mod. Physics for Engineer 260 The gas law was assumed that of a polytrope, i.e., one which through the entire star could be written as P = K(1+n)/n..where n is the polytropic index and g the ratio of specific heats. 1958 M. Schwarzschild Structure & Evol. Stars (1965) iii. 109 Stellar models in which the polytropic index is constant from center to surface have played an important role in the development of the theory of the stellar interior. 1999 Philos. Trans. (Royal Soc.) A. 357 254 κ is the polytropic index of the gas in the bubble, δ..is the dimensionless buoyancy parameter. < as lemmas |
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