Question

explain how does the density of solid change when solid is heated.Give a mathematical expression

Answer 1

Answer:

Density = Mass / Volume

When a substance is heated, it gains energy, the molecules gain kinetic energy. Depending on the amount of energy, the molecules may be able to overcome the intermolecular forces and thus move more freely. It explains the change of the substance state for solid => liquid => gas.

- Heating a substance increases its volume. This explain the reason why substances expand on heating.

- The mass doesn't change, but ratio of mass to the volume decreases.

- Therefore, the density of the substance decreases as it is heated.

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