SRL for [compressed]: CFCs are the primary ingredient in a gas , often referred to by the Du Pont trade name Freon , which is [compressed] to liquid form to serve as the cooling agent in refrigeration and air - conditioning equipment .
ARG-1: a gas | R-ARG-1: which | ARG-2: to liquid form | ARG-M-PNC: to serve as the cooling agent in refrigeration and air - conditioning equipment