To liquefy gaseous substances whose critical temperatures are below room temperature requires

Options

A. high pressure and lowering of temperature `("below"" T"_(c))`
B. low pressure and raising of temperature `("above"" T"_C)`
C. high pressure and raising of temperature `("above"" T"_(C))`
D. low pressure and lowering of temperature `("below"" T"_(C))`

Answer

A

Explanation

To liquefy gaseous substance whose critical temperature are below room temperature requires high pressue and low temperature.