膨ぼう張ちょう率りつ

noun

rate of expansion; expansion coefficient

Technical term used in physics, engineering, and materials science to describe how much a material expands per unit change in temperature or other conditions.

• この金きん属ぞくの熱ねつ膨ぼう張ちょう率りつは非ひ常じょうに低ひくい。