Question

why do objects expand when heated?​

Answer 1

Answer:

When a solid is heated, its atoms vibrate faster about their fixed points. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

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Answer 2

when we heat the solid, its temperature increases, which increases the thermal energy of the molecules. As a result, the amplitude of vibrations increases. When the amplitude of vibrations increase the mean spacing between the molecules also increases. As a result, the solid expands.

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