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Maximum water content in humid air vs. temperature.
The maximum moisture content possible in air - at saturation - varies with temperature. The table below indicates maximum moisture content in a cubic metre of air at various temperatures:
Air - Maximum Moisture Carrying Capacity
|(oC)||(oF)||(10-3 kg/m3)||(10-3 lb/ft3)|
Example - Moisture Carrying Capacity in Heated Air
Air is heated from 20oC to 50oC.
- from the table above the maximum moisture content in air at 20oC is 17.3 g/m3, and
- the maximum moisture content in air with temperature 50oC is 83 g/m3
The increased ability to carry moisture can be calculated as
100 % ((83 g/m3) - (17.3 g/m3)) / (17.3 g/m3)
= 380 %
This dramatic change is important to explain why heated air is so much more effective than cold air in drying processes.
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
The mass of water vapor present in moist air - to the mass of dry air.
The moisture holding capacity of air increases with temperature.
Saturation pressure and maximum water content in compressed air.
Dehumidifying by cooling, adsorption or absorption.
Dry Bulb, Wet Bulb and Dew Point temperatures can be used to determine the state of humid air.
Enthalpy change and temperature rise when heating humid air without adding moisture.
Pressure, temperature and volume in a perfect ideal gas like moist air (air with water vapor).
Cooling and dehumidifying processes of moist and humid air - sensible and latent cooling.
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 the mix of dry air and water vapor - moist humid air.
Sensible and latent heat of moist air.
Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy.
Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.
Specific volume of moist air is defined as the total volume of humid air per mass unit of dry air
Saturation pressure of water vapor in moist air vs. temperature.
Air flow required to remove vapor production from a room.
Weight of green and air-dried fire wood.
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