(dated, rare) to be about to faint

Water in a gaseous state, especially when diffused in the atmosphere. / Steam.

A contrail

(physics) The pressure that a vapor exerts, or the partial pressure if it is mixed with other gases.

(physics) The amount of energy required to change 1 gram of liquid to gas at its boiling point.

A layer of material or a laminate used to appreciably reduce the flow of water vapor into a roof assembly.

(physics) The amount of heat needed to change a unit mass of material from a liquid to a gas at its boiling point

plural of heat of vaporization

plural of vapor retarder

plural of vapor trail