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vapor pressure

the pressure exerted by the molecules of a vapor, especially that part of the total pressure exerted by vapor in a mixture of gases, as by water vapor in air.
Also called vapor tension.
Origin of vapor pressure
probably earlier than 1895-1900 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for vapor pressure
Historical Examples
  • Now he does not know the amount of vapor pressure and has no way of finding it out.

    The Dollar Hen Milo M. Hastings
  • The relative humidity is simply the ratio of the vapor pressure at the dew point to the pressure of saturated vapor (see Fig. 30).

    Seasoning of Wood Joseph B. Wagner
  • Another factor contributing to the ease of handling of 1,2-butylene oxide is its vapor pressure.

  • Now, the vapor pressure undergoes all manner of changes with the passing of storm centers and the changes of prevailing winds.

    The Dollar Hen Milo M. Hastings
  • But there is a general tendency for vapor pressure to increase with increase in outside temperature.

    The Dollar Hen Milo M. Hastings
  • This device simply gives a greater evaporating surface to the water and hence a greater addition to the vapor pressure.

    The Dollar Hen Milo M. Hastings
  • In the present-day incubator of either type we are wholly at the mercy of sudden climatic changes of vapor pressure.

    The Dollar Hen Milo M. Hastings
vapor pressure in Science
vapor pressure  
  1. The pressure exerted by a vapor on the solid or liquid phase with which it is in equilibrium. At pressures lower than the vapor pressure, more atoms or molecules of the liquid or solid vaporize and escape from the surface of the liquid or solid than are absorbed from the vapor, resulting in evaporation. At the vapor pressure the exchange is equal and there is no net evaporation. Also called evaporation pressure.

  2. The pressure exerted by water vapor in the atmosphere.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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vapor pressure in Culture

vapor pressure definition

In physics and chemistry, the atmospheric pressure that would be exerted by any single component of a gas if that component were the only one present. For example, the vapor pressure of oxygen in the atmosphere of the Earth is the pressure that would exist if everything but oxygen were removed. The total atmospheric pressure is the sum of the vapor pressures of all the materials in the atmosphere.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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