The difference is mostly due to the fact that air is a gas and the water is a liquid, because density depends a lot on the state of matter. In a solid ... of the atoms that make them up.

When the gas is cooled, the vapour condenses to make it a liquid again. Cool that liquid down even more, and it will freeze to make a solid. Liquids can freeze and melt, or evaporate and condense ...

Look at the shaving cream. Would you call it a solid, liquid, or a gas? Why? One characteristic of a solid is that it keeps its shape without being in a container. Does this make the shaving cream a ...