hello all

am new to this but here goes. im doing an f gas course course at the moment and am not fully understanding the vapour compression cycle. i have asked the lecturer a couple of questions but his answers dont clear it up for me. i think im right in saying that a certain refrigerant is always a certain temperature at a certain pressure ie r404a is around 5.1 bar at zero degrees and always will be. my question is, is it possible for a refrigerant to be a vapour or a liquid at the same temp/pressure.