Which of the following statements about thermal expansion is TRUE?

The statement regarding the coefficient of expansion for a liquid changing with temperature is accurate because the coefficient of thermal expansion indeed varies based on temperature changes. As temperature increases or decreases, the properties of the liquid, including how it expands or contracts, can change due to alterations in molecular interaction and kinetic energy.

In contrast, coefficients of expansion for solids and liquids differ; generally, solids have lower coefficients than liquids, implying that solids don’t expand or contract as much as liquids with temperature changes. Furthermore, while it is true that liquids can contract when cooled, this isn't a universal statement, as the behavior may differ among different liquids.

Additionally, the assertion that solids contract when heated is misleading, as solids expand when subjected to increased temperatures. Understanding the principles of thermal expansion is crucial in various engineering and scientific applications, making it important to know how different materials respond to temperature variations.