A gas is liquefied

Options

A. above critical temperature and below critical pressure
B. below critical temperature and above critical pressure
C. below critical temperature and pressure
D. above critical temperature and pressure

Answer

B

Explanation

Every substance has a critical temperature `(T_(c ))` above which its gas form cannot be made to liquefy , no matter how great at which a substance can exist as a liquid. The minimum pressure that must be applied to bring about liqueficiation at the critical temperature is called the critical pressure `(p_(c))`.