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mercury-vapor lamp a lamp in which light is produced by an electric discharge through vaporized mercury.
sodium-vapor lamp an electric lamp used for lighting highways and streets, containing sodium and neon and giving off a yellow light.
vapor lock a partial or complete interruption of the flow of liquid fuel in an internal combustion engine that is caused by the formation of bubbles of vapor or air in the fuel line.
vapor pressure the pressure of vapor, esp. in contact with its liquid form; vapor tension.
water vapor water in the form of gas, esp. at a temperature below the boiling point.