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thermal diffusivity
gen.	温度伝導率 (おんど・でんどうりつ) Engineering and Science Technical Dictionary (James Friend) ; 熱拡散率 (netsu-kakusanritsu) Engineering and Science Technical Dictionary (James Friend)
construct.	温度拡散率 (ondo-kakusanritsu)
tech.	温度伝播率 (ondo-denpanritsu)