State Changes

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State changes

Substances can exist as a solid, liquid or gas. Converting from one state to another usually involves heating or cooling.

Solids melt to become liquid, and liquids freeze to become solid. Liquids evaporate or boil to become gas, and gases condense to become liquid. (http://a.files.bbci.co.uk/bam/live/content/z32v9j6/small)Solids melt to become liquid, and liquids freeze to become solid. Liquids evaporate or boil to become gas, and gases condense to become liquid. (http://a.files.bbci.co.uk/bam/live/content/z32v9j6/large)

  • Heat must be supplied to a substance for it to melt, evaporate or boil. For example, you need to heat ice to melt it, and you need to heat water to make steam.
  • Heat must…

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