As the temperature is reduced, the motion of the molecules is also reduced.

It depends on the amount of temperature reduced and also the atmospheric presure of the place of experiment.

because both reduced temperature and reduced pressure are necessary for liquification of any gas...at room temp if you achieve the corresponding reduced pressure even then the reduced temperature condition is not fulfilled.....so it can not be liquified...univristy of engineering and technology Lahore

Reduced

Sealed environment.

Lower temperature.