on which factor does the tendency to liquefy a gasdepends

Liquefaction of gasses is physical transformation of a gas into a fluid state (buildup). 

Two vital properties of gasses are imperative in creating techniques for their liquefaction: basic temperature and basic weight. The basic temperature of a gas is the temperature at or above which no measure of weight, however extraordinary, will make the gas condense. The base weight required to melt the gas at the basic temperature is known as the basic weight.