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Substances can exist in three states of matter - solid, liquid and gas. Substances can change states. To change the state of a substance energy must be transferred to, or from, the substance.
They may notice the solid bottle, the liquid drink and the gas both within the drink and at the top of the bottle. Now ask them to predict how much gas they think is in the bottle in millilitres.
Although the three states of matter are solid, liquid, and gas, not all substances seem to fit perfectly into one of these groups. Take a look at the substance below and see if you can decide whether ...