Glossary

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vapor
The gaseous state of a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula. that typically exists as a liquidA state of matter in which the atomic-scale particles remain close together but are able to change their positions so that the matter takes the shape of its container or solidA state of matter having a specific shape and volume and in which the particles do not readily change their relative positions.; a gas at a temperatureA physical property that indicates whether one object can transfer thermal energy to another object. near or below the boiling pointThe temperature at which the vapor pressure of a liquid equals the pressure of the gas in contact with the liquid; usually this is atmospheric pressure. of the corresponding liquid.