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superadiabatic
superadiabatic adj. 
/ˌsjuːpədʌɪəˈbatɪk/,
Brit. /ˌsuːpədʌɪəˈbatɪk/
, /ˌsuːpədʌɪəˈbatɪk//ˌsjuːpədʌɪəˈbatɪk/U.S. /ˌsupərˌdaɪəˈbædɪk/
Physics and Meteorology designating a temperature gradient in a gas greater than the gradient it would have in an adiabatic expansion during upward motion, esp. (in the atmosphere) a lapse rate greater than that of dry air when it rises and expands adiabatically (viz. greater than about one degree Celsius per 100 metres); involving such a gradient./ˌsupərˌdaɪəˈbædɪk/ΘΚΠ
the world > matter > properties of materials > temperature > [adjective] > specific gradient
superadiabatic1914
1914 Jrnl. Franklin Inst. 178 552 A sufficient mechanical lift of a saturated layer of air would establish between it and the non-saturated layer above a superadiabatic temperature gradient.
1925 Nature 28 Feb. 301/2 The frequent superadiabatic lapse-rates which occur in the bottom layer of the atmosphere.
1978 Nature 26 Oct. 726/2 The theory of corona formation [on the sun] is not well developed, and the computation of acoustic fluxes is critically dependent on the theory of superadiabatic convection.
2006 P. A. Vesilind & T. D. DiStefano Controlling Environmental Pollution ix. 323 We then conclude that once a parcel of air under superadiabatic conditions is displaced upward, it keeps right on going.
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