The density of water vapor can be expressed as:
ρ w = 0.0022 p w / T (2)
p w = partial pressure water vapor (Pa, N/m 2 )
ρ w = density water vapor (kg/m 3 )
T = absolute dry bulb temperature (K)
Saturation pressure and density of water vapor for common temperatures
|( o C)||( o F)||(Pa)||(mmHg)||(psia)||(inHg)||(kg/m 3 )||10 -3 |
(lb/ft 3 )
The Saturation pressure of water vapor in moist air at dry bulb temperature 25 o C can be calculated:
First, convertion from °C to K:
( 25 °C) + 273 = 298 (K)
Then Eq. (1) is used:
p ws = e (77.3450 + 0.0057 (298 K) - 7235 / (298 K) ) / 298 [K] 8.2
= 3130 (Pa)
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
The drying force of air depends on the air moisture holding capacity and the water surface to air evaporation capacity.
Relative humidity in moist air can estimated by measuring the dry and wet bulb temperature.
Maximum water content in humid air vs. temperature.
The moisture holding capacity of air increases with temperature.
Thermodynamic properties of dry air - specific heat, ratio of specific heats, dynamic viscosity, thermal conductivity, Prandtl number, density and kinematic viscosity at temperatures ranging 175 - 1900 K.
Pressure, temperature and volume in a perfect ideal gas like moist air (air with water vapor).
Vapor and saturation pressure for some common liquids.
The pressure in a mixture of dry air and water vapor - humid or moist air - can be estimated by using Daltons Law of partial pressures.
Humidity ratio of moist air to humidity ratio of saturated moist air.
Density of moist air vs. pressure ranging 75 - 1000 mmHg.
Density of the mix of dry air and water vapor - moist humid air.
Mole fraction of water vapor is the ratio of water molecules to air and water molecules.
Dry and wet bulb temperatures, saturation pressure, water vapor weight, specific volume, heat and more.
Vapor pressures vs. dry and wet bulb temperatures in moist air.
Calculating heat removed with air by measuring the wet bulb temperature.
Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.
Vapor pressure and specific weight of water at temperatures ranging 32 to 212 oF - Imperial Units.
Online calculator, figures and tables with water saturation (vapor) pressure at temperatures ranging 0 to 370 °C (32 to 700°F) - in Imperial and SI Units.
The Wet Bulb Globe Temperature can be used to measure the general Heat-Stress index.
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