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using Plots # Saturated water vapor pressure [Pa] # See Ham, 2005. Useful Equations and Tables in Micrometeorology function water_vapor_saturated_pressure (Ta, P) Ta = Ta-273.15 es = (1.0007 + (3.46e-5 * (P / 1e3))) * 0.61121 * exp ((17.502 * Ta) / (Ta + 240.97)) * 1e3 return es end function water_vapor_density (e, Tair) Rs_v = 461.5 # J/(kg.K) specific gas constant for water vapor ρv = e ...
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 ...
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.
P s (T) is the saturation vapor pressure in hPa; exp(x) is the exponential function; T is the air temperature in degrees Celsius; Buck (1981) also lists enhancement factors for a temperature range of −80 to 50 °C (−112 to 122 °F) at pressures of 1,000 mb, 500 mb, and 250 mb. These coefficients are listed in the table below.
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 saturation dome uses the projection of a P–v–T diagram (pressure, specific volume, and temperature) onto the P–v plane. The points that create the left-hand side of the dome represent the saturated liquid states, while the points on the right-hand side represent the saturated vapor states (commonly referred to as the “dry” region).
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.
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: