Which of the following conditions is most favourable for converting a gas into liquid?
High pressure, low temperature
Low pressure, low temperature
Low pressure, high temperature
High pressure, high temperature
The correct option is A High pressure, low temperature The liquid can be changed in phase transformation to a gas by evaporation and a gaseous phase can be changed into liquid by condensation under conditions of high pressure and low temperature. For example, to change nitrogen into a liquid we need to cool it down below about $$-200 ^oC$$ and apply high pressure.