Critical pressure and critical temperature

Generally, the gas can be liquefied when the pressure increases to a certain value, but when the gas temperature is higher than a certain value, simply increasing the pressure cannot liquefy the gas, which is the critical temperature of the gas. The pressure required for the liquefaction of the gas at the critical temperature is the critical pressure of the gas. There is no difference between liquid and saturated steam at critical temperature and pressure, so the latent heat of gasification in this state is equal to zero.