basics of thermodynamics-part-9

What is partial pressure?

The partial pressure of each constituent is that pressure which the gas would exert if it occupied alone that volume occupied by the mixtures at the same temperature.

 What is compressibility factor?

The gas equation for an ideal gas is given by (PV/RT) = 1,
for real gas (PV/RT) is not equal to 1
(PV/RT) = Z for real gas is called the compressibility factor.

How does the Vander Waal’s equation differ from the ideal gas equation of state?

The ideal gas equation pV=mRT has two important assumptions,

1. There is little or no attraction between the molecules of the gas.

2. That the volume occupied by the molecules themselves is negligibly small compared to the volume of the gas. This equation holds good for low pressure and high temperature ranges as the intermolecular attraction and the volume of the molecules are not of much significance.

As the pressure increases, the inter molecular forces of attraction and repulsion increases and the volume of the molecules are not negligible. The real gas deviates considerably from the ideal gas equation [p+(a/V2)](V-b) = RT

What is humidification and dehumidification?

The addition of water vapour into air is humidification and the removal of water vapour from air is dehumidification.