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.

JOE:So how does it work? SEGE:'Well you see Joe, normally when substances heat up they transform from a solid and then a liquid before turning into a gas. 'Think about a regular ice cube melting.

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 ...

After viewing a model of salt, students help develop models for the processes of salt dissolving, water evaporating to form a gas, and salt re-forming as a crystal. The focus is that matter, whether ...