noun. the process of becoming a vapor.
- clouding up
- phase transition
- phase change
- state change
- physical change
noun. a visible suspension in the air of particles of some substance.
- water vapour
- water vapor
- stay in place
Example sentences of the word vapour
1. Noun, singular or mass
Foaming in a distillation column may be due to the passage of vapour or gas.
Tarp-like housewraps or other vapour barriers are an important part of keeping moisture and rot from entering the roofs and walls of a building.
3. Noun, plural
If this product is used for wall cavity insulation, it needs a spray on elastomeric vapour barrier on the inside of the wall to prevent mould and moisture damage.