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Glite Dictionary
vapor pressure

vapor pressure

1 6.0
The push of gas above a liquid in a closed container
  • noun
  • /ˈveɪpər ˈprɛʃər/
  • Specialized
translation icon : presión de vapor
  • The vapor pressure of CO2 is approximately seven times higher than that of R-22.
  • vapor pressure depends on temperature
  • saturation vapor pressure
  • low vapor pressure

The speed of the water jet is so high that we get a drop of the pressure to below the vapor pressure of water, resulting in cavitation.

Examples

  • Or another way to put it is that the saturation vapor pressure is the maximum you can have before condensation begins.

  • The strength of the water-vapor feedback rests on the observation that the relative humidity changes little with temperature; that is, the vapor pressure changes closely follow the change in saturation vapor pressure, as Figure 2 shows.

    Academic text (2012)

  • It's the temperature at which water at its current vapor pressure would condense.

  • "We are also getting basic information on how individual factors such as carbon cycling and water vapor pressure interact to produce that increase.

    Academic text (1995)

  • Careful temperature regulation ensured optimum vapor pressure in the boxes.

    Academic text (2006)

  • During heating, the vapor pressure of oil increases, and the oils are volatilized into vapors.

    Academic text (2004)

  • In the so-called water-vapor feedback, an increase in temperature supports an increase in the water vapor pressure throughout the troposphere, which further increases the IR opacity of the atmosphere.

    Academic text (2012)

  • Ammonia is used in unmanned spacecraft, primarily because its high vapor pressure and high latent heat lead to low vapor-side velocities and high-energy transfer capacities.

    Academic text (1997)

  • At higher temperatures, the vapor pressure of the liquid increases significantly.

  • The vapor pressure above the liquid must be measured to determine its boiling point.

Surface Forms

vapor pressure singular
vapor pressures plural
vapour pressures plural
vapour pressure singular

Morphology

vapor + pressure

This is a straightforward noun–noun compound where 'vapor' modifies 'pressure' to mean the pressure produced by a vapor. A B1 learner who knows 'vapor' (gas) and 'pressure' (force per area) can reasonably infer the general meaning, even if the precise thermodynamic nuance (equilibrium with liquid/solid) is technical.

Etymology

The noun vapor pressure gives a clear picture: the gas above a liquid, the vapor, pushes down like an invisible hand and that push is the pressure inside a closed space. Imagine a pot with a lid; when the push from the vapor equals the outside air, the liquid starts to boil, so 'vapor pressure' tells us how strongly the vapor pushes and why liquids boil or need careful storage.