Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
열주식은 온도가 상승할 때 물체가 팽창하는 현상입니다.yeoljusik-eun ondoga sangseunghal ttae mulchega paengchanghaneun hyeonsang-imnida.Thermal expansion is the phenomenon where an object expands when the temperature rises.