The pressure or tension of a confined body of vapor of a chemical substance in equilibrium with the solid or liquid form of the substance. The pressure of a given saturated vapor is a function of the temperature only, and may be measured by introducing a small quantity of the substance into a barometer and noting the depression of the column of mercury.
The pressure exerted at a given temperature of a vapor in equilibrium with its liquid or solid form.
Pressure imposed by either a vapor or gas.
The pressure exerted by a liquid when confined in a specified tank or test apparatus.
The absolute pressure at which a fluid will vaporize, at a given fluid temperature.
vapour pressure. The partial pressure of a gas in equilibrium with a condensed form (solid or liquid) of the same substance.
The pressure at which water will change to vapor (boil) at a certain temperature. The vapor pressure of water increases with temperature and reduces the available pressure at the pump suction.
That part of the total atmospheric pressure attributable to its water-vapor content.
The pressure exerted by a vapor held in equilibrium with its solid or liquid state.
the pressure of the vapor in equilibrium with its liquid or solid phase.
the force per unit area exerted by a vapor in an equilibrium state with its pure solid, liquid, or solution at a given temperature. Vapor pressure is a measure of a substance's propensity to evaporate. Vapor pressure increases exponentially with an increase in temperature.
The pressure generated by gases boiled off a liquid in a closed space. Standardized tests of this property, Reis method ( RVP) most popular among them, report the observed pressure of liquid and gas in equilibrium at a particular temperature.
The pressure of the gas that collects above a liquid in a closed container.
Vapor pressure is the pressure of a gas in equilibrium with a liquid (or, in some usage, a solid) at a specified temperature.
A relative measure of the volatility of a chemical in its pure state. The pressure exerted by a gas that is in equilibrium with its solid or liquid form. Volatile: Capable of vaporizing or evaporating readily.
Pressure exerted by water vapor molecules in a given quantity of atmosphere.
Dalton's Law for a mixture of perfect gases states that the mixture pressure is equal to the sum of the partial pressures of the constituents. The partial pressure of moisture is called vapor pressure, and is expressed as: Total Pressure (Pt) = Partial Pressure of Air (Pa) + Partial Pressure of Moisture (Pv)
Measure of pressure of the vapor accumulated above the liquid. Increased vapor pressures indicate liquid volatility.
The pressure exerted on a liquid and vapor surface.
the pressure (at a given temperature) at which a liquid is in equilibrium with is vapor
the pressure exerted by a vapor; often understood to mean saturated vapor pressure (the vapor pressure of a vapor in contact with its liquid form)
The pressure exerted by a vapor which is in equilibrium with its own liquid.
Pressure (measured in pounds per square inch absolute - psia) exerted by a vapor. If a vapor is kept in confinement over its liquid so that the vapor can accumulate above the liquid (the temperature being held constant), the vapor pressure approaches a fixed limit called the maximum (or saturated) vapor pressure, dependent only on the temperature and the liquid.
In a closed system at a constant temperature the pressure exerted by gaseous molecules that are in equilibrium with molecules of the same kind in the liquid or solid state.
Total gas pressure at equilibrium due to a specific compound present as liquid and gas. For example, the pressure due to the evaporation of a solvent when as much has evaporated as the air can hold under current conditions.
The pressure from a liquid vaporizing in a closed container. This pressure will vary with different liquids and will vary depending upon temperature.
Partial pressure of a liquid's vapor required to maintain the vapor in equilibrium with the condensed liquid or solid; also referred to as saturation vapor pressure.1
The pressure of a confined liquid such that the vapor collects above it.
The partial pressure of water vapor in the atmosphere.
The partial pressure of water vapor in an air-water system.
The pressure exerted by water vapor molecules in a given volume of air.
pressure of a confined vapor in equilibrium with its liquid at a specified temperature, i.e. a measure of a liquid's volatility.
Below this pressure, the liquid at this temperature will vaporize.
the pressure a saturated vapor exerts above its own liquid in a closed container.
The pressure exerted by a vapor – at equilibrium with liquid at atmospheric pressure. (source: ASHRAE F97)
Is the pressure exerted by a vapor confined within a given space. The vapor may be the sole occupant of the space, or may be associated with other gases. ( 030)
A function of the temperature and pressure of the system.
Pressure as exerted from a vapor that is in equilibrium state with a liquid or solid.
the pressure exerted when a solid or liquid is in equilibrium with its own vapor. Vapor pressure is a function of the substance and of the temperature.
The pressure exerted by a vapor that is calculated based upon relative humidity and temperature. The higher the humidity and higher temperature, in degrees Fahrenheit, the greater the vapor pressure exerted.
in meteorology, the pressure exerted only by molecules of water vapor in the air
The pressure created by a gas at any given temperature in equilibrium with its liquid state. The pressure build up (particularly in warm weather) in a car fuel tank is an example of vapor pressure. Go to top
the pressure of the vapor over a liquid at equilibrium in a closed container.
Describes a measure of a liquids tendency to evaporate. Every liquid has a characteristic vapor pressure that changes as the internal temperature of the liquid changes. Generally, as the temperature of a liquid increases, its vapor pressure also increases.
The pressure at which a liquid boils at a specified temperature.
The pressure at which a liquid and its vapor are in equilibrium at a definite temperature.
A fixed value that typically refers to the saturated vapor pressure at a specific temperature for all substances.
The pressure at any given temperature exerted by a vapor that is in equilibrium with its liquid or solid form.
The pressure exerted when a solid or liquid is in equilibrium with its own vapor at a particular temperature.
The particle pressure of a vapor at the surface of its parent liquid.
The developed pressure within a closed vessel containing a liquid. Each liquid has its own vapor pressure which varies with temperature
The pressure exerted by a liquid in equilibrium with itself at a given temperature. The vapor pressure of water is 14.7 psi at 212°F and increases with temperature. At reduced pressure liquids will vaporize at lower temperatures which increases the temperature differential during drying.
The outward pressure of a mass of vapor at a given temperature. It is the index of the volatility of a liquid.
The pressure exerted by a vapor that is in equilibrium with its solid or vapor liquid form.
the ability of a liquid to move from the liquid state to the gas state (a vapor). Vapor pressure is often measured in millimeters (mm) of mercury (Hg).
measure of the pressure of vapor accumulated above a sample of gasoline or other volatile fuel in a standard bomb at 100°F (37.8°C). Used to predict the vapor locking tendencies of the fuel in a vehicle's fuel system. Controlled by law in some areas to limit air pollution from hydrocarbon evaporation while dispensing.
The pressure, often expressed in millimeters of mercury (mm Hg), at which a vapor is in a state of balance with its liquid or solid form.
The pressure exerted by the molecules of a given vapor. In meteorology, it is considered as the part of total atmospheric pressure due to the water vapor content. It is independent of other gases or vapors.
A measure of a substance's propensity to evaporate, vapor pressure is the force per unit area exerted by vapor in an equilibrium state with surroundings at a given pressure. It increases exponentially with an increase in temperature. A relative measure of chemical volatility, vapor pressure is used to calculate water partition coefficients and volatilization rate constants.
The pressure exerted on top of a saturated liquid.
In chemistry and physics, vapor pressure is the pressure of a vapor in equilibrium with its non-vapor phases. All solids and liquids have a tendency to evaporate to a gaseous form, and all gases have a tendency to condense back. At any given temperature, for a particular substance, there is a partial pressure at which the gas of that substance is in dynamic equilibrium with its liquid or solid forms.