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The saturation vapor density (SVD) is the maximum density of water vapor in air at a given temperature. [1] The concept is related to saturation vapor pressure (SVP). It can be used to calculate exact quantity of water vapor in the air from a relative humidity (RH = % local air humidity measured / local total air humidity possible ) Given an RH percentage, the density of water in the air is ...
An important basic value, which is not registered in the table, is the saturated vapor pressure at the triple point of water. The internationally accepted value according to measurements of Guildner, Johnson and Jones (1976) amounts to: P w (t tp = 0.01 °C) = 611.657 Pa ± 0.010 Pa at (1 − α) = 99%
A "wet" fluid shows a negative saturation vapor curve. If overheating before the expansion is limited, a two-phase state is obtained at the end of the expansion. An "isentropic" fluid shows a vertical saturation vapor curve. It remains very close to the saturated vapor state after an hypothetical isentropic expansion.
The original reason for starting a vapor–liquid phase equilibria data collection was the development [2] of the group contribution method UNIFAC which allows to estimate vapor pressures of mixtures. The DDB has since been extended to many other properties and has increased dramatically in size also because of intensive (German) government aid.
saturated adiabats or pseudoadiabats = lines representing the temperature of a rising parcel saturated with water vapor mixing ratio = lines representing the dewpoint of a rising parcel The lapse rate , dry adiabatic lapse rate (DALR) and moist adiabatic lapse rate (MALR), are obtained.
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum .
Density (saturated vapor) 1 atm, -0.5 °C 2.6 kg/m³ ... Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. Vapor pressure of n-butane.
e * is the saturation water vapor pressure T is the absolute air temperature in kelvins T st is the steam-point (i.e. boiling point at 1 atm.) temperature (373.15 K) e * st is e * at the steam-point pressure (1 atm = 1013.25 hPa) Similarly, the correlation for the saturation water vapor pressure over ice is: