Vapour
Definition 1 of 2
Pro Tip 1/3
Change of State
The term 'vapour' is used when a substance changes from solid or liquid to gas. The boiling kettle released a stream of vapour.
Pro Tip 2/3
Visible Gas
'Vapour' often refers to gas that you can see, like steam or fog. The cold air turned his breath into a vapour.
Pro Tip 3/3
Not Always Water
While it's often water, 'vapour' can be any liquid or solid turned gas. Gasoline vapour can be highly flammable.