TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

The pressure exerted by the molecules of a given vapor.  3, record 1, English, - steam%20pressure

Record number: 1, Textual support number: 1 OBS

For a pure, confined vapor, it is that vapor's pressure on the walls of its containing vessel; and for a vapor mixed with other vapors of gases, it is that vapor's contribution to the total pressure (i.e., its partial pressure).  3, record 1, English, - steam%20pressure

Record number: 1, Textual support number: 2 OBS

In meteorology, vapor pressure is used almost exclusively to denote the partial pressure of water vapor in the atmosphere. Care must be exercised in interpreting the term's meaning as used in other branches of science.  3, record 1, English, - steam%20pressure

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

La pression de vapeur d'un liquide pur est la pression exercée par les molécules de gaz au-dessus du liquide. Elle se mesure dans un système fermé à l'équilibre. Un liquide est d'autant plus volatil que sa pression de vapeur est grande.  1, record 1, French, - pression%20de%20vapeur

Record number: 1, Textual support number: 2 CONT

On appelle tension de vapeur d'un liquide pur, la pression sous laquelle ce liquide est en équilibre avec sa vapeur saturante. La tension de vapeur n'est fonction que de la température et de la nature du corps, c'est-à-dire que, pour un liquide déterminé, elle ne dépend que de la température. À une température donnée correspond pour le liquide considéré une tension de vapeur fixe.  2, record 1, French, - pression%20de%20vapeur

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Presión que ejerce un vapor en equilibrio con el líquido o el sólido que lo genera.  1, record 1, Spanish, - presi%C3%B3n%20de%20vapor

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

Pressure exerted by a vapour in a confined space.  1, record 2, English, - vapour%20pressure

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Pression exercée par la vapeur dans un espace clos.  1, record 2, French, - tension%20de%20vapeur%20d%27eau%20dans%20l%27air%20humide

Record 2,  Textual support,  Spanish

Record number: 2, Textual support number: 1 DEF

Presión ejercida por el vapor en un espacio cerrado.  1, record 2, Spanish, - presi%C3%B3n%20del%20vapor%20de%20agua

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

Product of the mole fraction of the water vapour (N[substract v]) and the pressure of the moist air (p): e' = N[substract v]p = rp/(0.62197 + r), where r is the mixing ratio.  2, record 3, English, - vapour%20pressure

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 DEF

Produit du titre molaire de la vapeur d'eau N_v par la pression totale p de l'air humide : e' = N_vp = rp/(0,62197 + r), où r est le rapport de mélange.  1, record 3, French, - tension%20de%20vapeur%20d%27eau%20dans%20l%27air%20humide

Record 3,  Textual support,  Spanish

Record number: 3, Textual support number: 1 DEF

Producto de la fracción molar del vapor de agua N_v por la presión p del aire húmedo: e' = N_vp = rp/(0,62197 + r), en donde r es la relación de mezcla.  1, record 3, Spanish, - presi%C3%B3n%20del%20vapor%20de%20agua

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

The partial pressure of water vapor in an air-water system.  5, record 4, English, - vapor%20pressure

Record number: 4, Textual support number: 1 OBS

In the Glossary of Meteorology (HUMET, 1970), the term "vapor tension" in the sense of "vapor pressure" is considered obsolete.  6, record 4, English, - vapor%20pressure

Record number: 4, Textual support number: 2 OBS

In meteorology, vapor pressure is used almost exclusively to denote the partial pressure of water vapor in the atmosphere. Care must be exercised in interpreting the term's meaning as used in other branches of science.  3, record 4, English, - vapor%20pressure

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Pression partielle de la vapeur d'eau dans l'air.  4, record 4, French, - tension%20de%20vapeur

Record number: 4, Textual support number: 1 OBS

La pression de la vapeur dans le milieu qui la contient est en général appelée tension de vapeur.  5, record 4, French, - tension%20de%20vapeur

Record number: 4, Textual support number: 2 OBS

En météorologie, on l'exprime en hectopascals.  3, record 4, French, - tension%20de%20vapeur

Record 4,  Textual support,  Spanish

Record number: 4, Textual support number: 1 DEF

Presión parcial del vapor de agua en el aire.  2, record 4, Spanish, - tensi%C3%B3n%20de%20vapor

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

The pressure of water vapour at a given temperature ...  5, record 5, English, - water%20vapour%20pressure

Record number: 5, Textual support number: 1 CONT

Water vapour pressure is the atmospheric pressure which is exerted by water vapour (water in its gaseous state). It is one way of measuring the humidity of the air. At a given temperature, an increase of water vapour in the air corresponds to an increase in the humidity of the air. Water vapour is supplied to the atmosphere by evaporation of water from oceans, lakes, wet land surfaces or from vegetation (transpiration). Water vapour absorbs the sun's radiation. As a result, the sunlight received at the earth's surface will be more intense in a drier atmosphere.  6, record 5, English, - water%20vapour%20pressure

Record 5,  Textual support,  French

Record number: 5, Textual support number: 1 CONT

L'humidité absolue [...] est la masse de vapeur d'eau contenue dans une unité de volume d'air. Cette tension de vapeur d'eau, qui s'exprime souvent en grammes par m³, est affectée généralement du symbole f.  2, record 5, French, - pression%20de%20vapeur%20d%27eau

Record 5,  Textual support,  Spanish

Record number: 5, Textual support number: 1 DEF

Presión máxima del vapor de agua en presencia de agua líquida.  1, record 5, Spanish, - presi%C3%B3n%20del%20vapor%20de%20agua

Record 6,  Textual support,  English

Record number: 6, Textual support number: 1 DEF

The pressure exerted by a saturated vapour above its own liquid in a closed container.  5, record 6, English, - vapor%20pressure

Record number: 6, Textual support number: 1 CONT

Three facts are important to remember: (1) vapour pressure of a substance at 100°F (38°C) is always higher than the vapour pressure of the substance at 68°F (20°C). (2) Vapour pressures reported in mm Hg are usually very low pressures; 760 mm Hg is equivalent to 14.7 pounds per square inch. (3) the lower the boiling point of a substance, the higher its vapour pressure.  6, record 6, English, - vapor%20pressure

Record number: 6, Textual support number: 1 OBS

[The] vapor pressure [is] usually expressed in millimeters of mercury ...  7, record 6, English, - vapor%20pressure

Record number: 6, Textual support number: 2 OBS

The vapor pressure for a compressed gas is expressed in psig. The vapor pressure of commercial propane is 124 psig at 70°F and 286 psig at 130°F.  8, record 6, English, - vapor%20pressure

Record number: 6, Textual support number: 3 OBS

It is important to make a distinction between the vapor pressure of a liquid ... and the pressure of a vapor. The vapor pressure of a pure liquid is a unique and characteristic property of the liquid and depends only upon the temperature. A gas or vapor may, on the other hand, exert any pressure within reason, depending upon the volume to which it is confined, provided it is not in contact with its liquid phase.  9, record 6, English, - vapor%20pressure

Record 6,  Textual support,  French

Record number: 6, Textual support number: 1 DEF

Pression exercée, à une température donnée, par la vapeur qu'émet un liquide, sur les parois closes du récipient qui le contient.  3, record 6, French, - pression%20de%20vapeur

Record number: 6, Textual support number: 1 CONT

On appelle vapeurs les corps gazeux qu'on trouve habituellement, [...] à l'état liquide, ou qu'on peut facilement ramener à cet état. [...] Dans des conditions particulières, la vapeur peut se trouver en contact avec la phase liquide et en équilibre avec celle-ci; si l'équilibre est stable, la pression de la vapeur ne dépend que de la température, et la vapeur est alors dite saturée. La pression de la vapeur dans le milieu qui la contient est en général appelée tension de vapeur; la vapeur peut se condenser [...] sous l'effet d'un accroissement de pression.  4, record 6, French, - pression%20de%20vapeur

Record number: 6, Textual support number: 1 OBS

La tension de vapeur est maximum quand la vapeur est saturée.  3, record 6, French, - pression%20de%20vapeur

Record 6,  Textual support,  Spanish