vapor

va*por

noun

{bc}diffused matter (such as smoke or fog) suspended floating in the air and impairing its transparency

vapor

verb

{bc}to rise or pass off in vapor

va*pour

vapor barrier

noun

{bc}a layer of material (such as roofing paper or polyethylene film) used to slow or prevent the absorption of moisture into a construction (such as a wall or floor)

vapor lock

noun

{bc}partial or complete interruption of flow of a fluid (such as fuel in an internal combustion engine) caused by the formation of bubbles of vapor in the feeding system

vapor pressure

noun

{bc}the pressure exerted by a vapor that is in equilibrium with its solid or liquid form

vapor trail

noun

{bc}{sx|contrail||}

mercury-vapor lamp

noun

{bc}an electric lamp in which the discharge takes place through mercury vapor

sodium-vapor lamp

noun

{bc}an electric lamp that contains sodium vapor and electrodes between which a luminous discharge takes place and that is used especially for lighting highways

water vapor

noun

{bc}water in a vaporous form especially when below boiling temperature and diffused (as in the atmosphere)