Vapor Retarders: Special materials used in the installation of thermal insulation to reduce the passage of water vapor. These materials include treated papers, plastic sheets, and metallic foils.

 

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Vapor Retarders: Special materials used in the installation of thermal insulation to reduce the passage of water vapor. These materials include treated papers, plastic sheets, and metallic foils.

Vapor Pressure: The pressure exerted by the molecules of a given vapor. In meteorology, it is considered as the part of total atmospheric pressure due to the water vapor content. It is independent of other . . . View Full Definition

Vapor Discharge Lamp: Is a lamp in which electrical current passes through a vapor or gas rather than through a wire filament, thus producing illumination.

Vapor Pressure Lowering: A colligative property of solutions. The vapor pressure of a solution is always lower than the vapor pressure of the pure solvent; the ratio of solution to pure solvent vapor pressures is ap . . . View Full Definition

Vapor Barrier: A building product installed on exterior walls and ceilings under the drywall and on the warm side of the insulation. It is used to retard the movement of water vapor into walls and prevent . . . View Full Definition

Vapor Trail: A cloudlike streamer or trail often seen behind aircraft flying in clear, cold, humid air. A vapor trail is created when the water vapor from the engine exhaust gases are added to the atmosp . . . View Full Definition

Water Vapor (H2O): Water in gaseous form. It is one of the most import constituents of the atmosphere. Due to its molecular content, air containing water vapor is lighter than dry air. This contributes to the . . . View Full Definition

Mercury Vapor Lamp: Is an artificial light source produced by passing current through mercury vapor in a tube.

Evaporate: To convert a liquid into a gas.

Enthalpy Of Vaporization: The change in enthalpy when one mole of liquid evaporates to form one mole of gas. Enthalpies of vaporization are always positive because vaporization involves overcoming most of the intermo . . . View Full Definition