At the same temperature, the lower the air pressure, the easier it is to vaporize and the more difficult it is to liquefy. The higher the air pressure, the more difficult it is to vaporize and the eas

At the same temperature, the lower the air pressure, the easier it is to vaporize and the more difficult it is to liquefy. The higher the air pressure, the more difficult it is to vaporize and the easier it is to liquefy. No contradiction

First of all, you don't know what vaporization is and what liquefaction is.

Vaporization refers to the change of liquid from liquid to gas and volatilization. The lower the air pressure, the easier it is to volatilize.

Liquefaction is the opposite process of vaporization, from gas to liquid. The greater the air pressure, the easier it is to liquefy.

The vaporization process absorbs energy, and the liquefaction process releases energy.

Vaporization and liquefaction are reversible, so in the same environment, the energy absorbed by vaporization equals the energy released by liquefaction, that is, the heat of vaporization equals the heat of liquefaction.