In liquids, the particles are touching but are free to move around each other like balls in a ball pool. In a gas, the particles aren’t touching at all, but are flying around randomly.

When substances are heated and expand, their particles do not get any bigger ... and are close together, touching many of their neighbours. There are some gaps, but liquids cannot usually be ...

the particles of the substance are still all touching but they vibrate more than in solids, and they slide past each other easily. There is no fixed structure in the liquid as the particles are not in ...

When substances are heated and expand, their particles do not get any bigger ... and are close together, touching many of their neighbours. There are some gaps, but liquids cannot usually be ...