The mole fraction of water vapor is the ratio of the number of mole of water vapor in the moist air - to the total number of mole of dry air and water vapor.
The mole fraction of water vapor in moist air can be expressed as
xw = nw / (na + nw) (1)
xw = mole fraction of water vapor
nw = mole of water
na = mole of air
Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.
Dry air is a mechanical mixture of nitrogen, oxygen, argon and several other gases in minor amounts.
Dry air is a mixture of gases where the average molecular weight (or molar mass) can be calculated by adding the weight of each component.
Molar specific heats for some common gases at constant volume.
Saturation pressure of water vapor in moist air vs. temperature.
The mole is the SI base unit for an amount of a substance.
Definition and molecular weight (molar mass) of some common substances.
A salt solutions can be used maintain a particular value of relative humidity.
The relationship between volume, pressure, temperature and quantity of a gas, including definition of gas density.
The Universal and Individual Gas Constants in fluid mechanics and thermodynamics. Individual gas constants for the most common gases.