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20 October 2014
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Substances can exist in different states. The same substance can either be in a solid or a liquid state. For example we mostly see water in the liquid state. If you put it in the freezer, though, it turns into solid water, or ice.

Solids often have to be warmed to turn them into liquid. Liquids need to be cooled to turn them into solids. How much you have to warm them or cool them depends on the substance.

Solid water (ice) can be turned into liquid water, just by taking it out of a freezer and leaving it in a warm room. Most metals need the heat of a furnace before they become liquid.

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