Question

which action causes a substance to expand and shrink (contract)?​

Answer 1

Answer:

heat energy

Explanation:

When you heat a solid, most of the heat goes into the vibrations of the atoms," explains Brent Fultz, professor of materials science and applied physics and a coauthor of the paper. In normal materials, this vibration causes atoms to move apart and the material to expand.

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Answer 2

Answer:

Change in temperature ...for an example if a substance get heated it expand while if substance cooled it get contract...