- increasing the temperature of a substance increases its internal energy
- the strength of the forces of attraction between the particles of a substance explains why it is a solid, liquid or a gas
- when a substance is heated:
if its temperature rises, the kinetic energy of its particles increases
if it melts or it boils, the potential energy of its particles increases
- the pressure of a gas on a surface is caused by the particles of the gas repeatedly hitting the surface
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