Question

How we can convert the gas into liquid state ?

Answer 1

Answer:

mostly by decreasing the temperature. ..

Answer 2

Phase changes can be brought about by heating or cooling. For example if water (a liquid) is heated enough, it evaporates and becomes water vapor or steam (agas). This kind of phase change--liquid to gas--is called evaporation or vaporization. Water vapor can in turn be cooledto form liquid water.