膨ぼう張ちょう係けい数すうMeaningsNoun1. coefficient of expansionKanji used膨bulge張lengthen係be involved with数numberPitch accentぼうちょうけいすうぼうちょうけいすうComposed of膨ぼう張ちょうexpansion; swelling; increase; growthNoun係けい数すうcoefficient; factor; proportional constant; modulusNoun