Question

choose the correct answer. why does the volume of a substance expand when it gains heat/energy? because its molecules move further apart because its molecules move clos
together

Explanation:

When a substance gains heat/energy, its molecules gain kinetic energy. This causes them to move more vigorously. As a result, the molecules move further apart from each other, leading to an increase in the volume of the substance (thermal expansion). If molecules moved closer together, the volume would decrease, which is the opposite of what happens when heat/energy is gained.

Answer:

"because its molecules move further apart"