Abstract
This chapter discusses liquefaction of gases; if the temperature and pressure of a gas can be brought into the region between the saturated liquid and saturated vapor lines then the gas becomes 'wet' and this 'wetness' condenses giving a liquid. Most gases existing in the atmosphere are extremely superheated, but are at pressures well below their critical pressures. Further, it discusses liquefaction by cooling method; this method is satisfactory if the liquefaction process does not require very low temperatures. A number of common gases can be obtained in liquid form by cooling. Examples of these are the hydrocarbons butane and propane, which can both exist as liquids at room temperature if they are contained at elevated pressures. Mixtures of hydrocarbons can also be obtained as liquids and these include liquefied petroleum gas (LPG) and liquefied natural gas (LNG).
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