conservation of mass (noun)

1. Why did the chemist always observe the conservation of mass? Because he didn't want to lose his atoms and get charged with battery!

2. In the land of Mysidia, a magical realm governed by the conservation of mass, the wizards could transmute ordinary rocks into precious gems.

3. The architect carefully calculated the conservation of mass before designing the massive cantilevered structure of the futuristic building.

4. The artist captured the essence of conservation of mass in his sculpture, depicting the transformation of a solid block into intricate flowing patterns.