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vapor pressure

noun
1.
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
1895-1900
probably earlier than 1895-1900
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for vapor pressure
  • Saturation vapor pressure varies with atmospheric pressure.
  • Propane provides higher vapor pressure to the fuel for better performance in cold weather.
  • The vapor pressure of water thus measures the amount of water vapor in the air.
  • The evaporation creates a negative water vapor pressure develops in the surrounding cells of the leaf.
  • By the time the beam reaches the mantle, the vapor pressure might be roughly equal to the confining pressure.
  • vapor pressure is a fundamental chemical property related to volatility.
  • The boiling point of water is the temperature at which its vapor pressure equals the atmospheric pressure.
  • In general what is required is that the pressure above the ice be less than the vapor pressure of ice at the given temperature.
  • The submitter did not provide vapor pressure data for any of the category members.
  • From the vapor pressure data activity coefficients at different temperatures have been obtained.
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 American Heritage® 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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