Question

How does the phase diagram of a substance illustrate the relationship between temperature and kinetic energy of molecules

Answer 1

A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance.

What is a Phase diagram ?

These diagrams indicate the physical states that exist under specific conditions of pressure and temperature, and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points).

• At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous.

• The phase change between a liquid and a gas has some similarities to the phase change between a solid and a liquid.

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