Vapor pressure (also known as Equilibrium vapor pressure or Saturation vapor pressure), is the pressure of a vapor in equilibrium with its non-vapor phases.
Vapor Pressure The pressure exerted by water vapor molecules in a given volume of air.
Variable Ceiling A ceiling of less than 3,000 feet which rapidly increases or decreases in height by established criteria during the period of observation.
Vapor Pressure - in meteorology, the pressure exerted only by molecules of water vapor in the air
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VAPOR PRESSURE
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.
Vapor Pressure
The partial pressure of water vapor in an air-water system.
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The partial pressure of water vapor in an air-water system.
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Vapor pressure: The pressure exerted by water molecules in a given volume of the atmosphere. It is a measure of the contribution of water vapor to the total pressure.
Velocity: The change of direction and position of an object with time.
Vapor pressure The pressure exerted by the water vapor molecules in a given volume of air.
Vernal equinox The equinox at which the sun approaches the Northern Hemisphere and passes directly over the equator. Occurs around March 20.
VAPOR PRESSURE- The amount of pressure (usually expressed in millibars) exerted from molecules of water vapor independent from the pressure exerted from the air. The vapor pressure is a trace to about 4% of the total air pressure at any one time.
Vapor pressure The portion of the total air pressure exerted by the water vapor component of air.
Variables of state Temperature, pressure and density of air.
vapor pressure—In meteorology, the pressure of water vapor in the atmosphere. Vapor pressure is that part of the total atmospheric pressure due to water vapor and is independent of the other atmospheric gases or vapors.
Actual vapor pressure See Vapor pressure.
Adiabatic process A process that takes place without a transfer of heat between the system (such as an air parcel) and its surroundings.
The vapor pressure of a system, at a given temperature, wherein the vapor of a substance is in equilibrium with a plane surface of that substance's pure liquid or solid phase.
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Actual vapor pressure is a measurement of the amount of water vapor in a volume of air and increases as the amount of water vapor increases. Air that attains its saturation vapor pressure has established an equilibrium with a flat surface of water.
Saturation vapor pressure(6)
The maximum amount of water vapor necessary to keep moist air in equilibrium with a surface of pure water or ice. It represents the maximum amount of water vapor that the air can hold at any given temperature and pressure.
4. Humidity - Vapor Pressure - Saturation Vapor Pressure
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The ratio of the vapor pressure to the saturation vapor pressure with respect to water. This quantity is alternatively defined by the World Meteorological Organization as the ratio of the mixing ratio to the saturation mixing ratio.
SATLSatelliteSaturation Vapor PressureThe vapor pressure of a system, at a given temperature, wherein the vapor of a substance is in equilibrium with a plane surface of that substance's pure liquid or solid phase.
Vapor PressureThe partial pressure of water vapor in an air-water system.Variable WindSame as Variable Wind Direction; a condition when ...
The equilibrium vapor pressure at the surface of a saturated salt solution is less than that for a similar surface of pure water at the same temperature. This effect is exhibited by all salt solutions but particularly so by lithium chloride.
relative humidity - The ratio of the vapor pressure to the saturation vapor pressure with respect to water.
relative humidity: ratio of the actual vapor pressure of the air to the saturation vapor pressure for the surrounding air temperature. In other words, how much water the air is holding divided by how much water the air is capable of holding.
Relative humidity The (dimensionless) ratio of the actual vapor pressure of the air to the saturation vapor pressure. The relative humidity is usually expressed in per cent, and can be computed from psychrometric data. See humidity.
At a given ambient air temperature, the dimensionless ratio between the actual vapor pressure of air to the saturation vapor pressure. Corresponding ratios of mixing ratio can be substituted. Relative humidity is usually expressed as a percentage.
Relative humidity: the ratio of the actual water vapor pressure at a given time to the vapor pressure that would occur if the air were saturated at the same ambient temperature.
Psychrometric Tables These are tables used by meteorologists to determine measures of atmospheric water content (dewpoint, vapor pressure, or relative humidity) from the observed dry-bulb and wet-bulb temperature values taken with a psychrometer.
RELATIVE HUMIDITY A type of humidity that considers the ratio of the actual vapor pressure of the air to the saturation vapor pressure. It is usually expressed in percentage.
The temperature at which the equilibrium vapor pressure between a liquid and its vapor is equal to the external pressure on the liquid. The boiling point of pure water at standard pressure is 100°C or 212°F.
Monthly Climatic Data of the World (MCDW) A National Climatic Data Center publication which contains monthly mean temperature, pressure, precipitation, vapor pressure, and sunshine for approximately 2, ...
Relative humidity - the ratio of vapour pressure to the vapor pressure that would happen if the air were saturated without changing the temperature.
When vapor, water and ice are simultaneously present in a cirrocumulus cloud of supercooled water droplets, the droplets evaporate in favor of ice crystals because of the difference in vapor pressure, ...
Refractivity (N): N = (n-1)*10^6, where n is refractive index and N is a function of temperature, pressure and vapor pressure (in the atmosphere).
Psychrometric tables Tables prepared from the psychrometric formula and used to obtain vapor pressure, relative humidity, and dew point from values of wet-bulb and dry-bulb temperatures. p.t.u.
RefractivityExpressed as N; N = (n-1)*106, where n is refractive index and N is a function of temperature, pressure and vapor pressure (in the atmosphere).
 See also: Pressure, Temperature, Water, Air, Surface
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