TEMPERATURE
  • Temperature is a measure of how much energy particles have.

  • The hotter something is the more energy the particles have and visa versa.

  • So the particles in a bowl of ice cream are going to have much less energy than the particles in a steaming cup of tea.

Changing a Solid To a Liquid
  • If you heat a solid the particles stay the same but they vibrate more

  • As a result they move slightly further apart, so the solid expands.

  • If you carry on heating, the forces of attraction in a solid are weakened, and the solid melts and becomes a liquid.

This change happens at the melting point.

•A substances melting point is the temperature at which it changes from a solid to a liquid

•This requires energy to be put in

•The particles are able to move more

Changing a Liquid to a Gas
  • If you carry on heating the liquid, the particles move around more quickly.

  •  As it gets hotter, the forces of attraction holding the particles together in the liquid break, and the particles are free.

  • As more heat energy is added the liquid evaporates and becomes a gas.

This change happens at the boiling point

•A substances boiling point is the temperature at which is changes from a liquid to a gas

•This requires energy to be put in

•The particles are able to move more

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