If you have a Red Seal in Refrigeration, the technical errors in this article must hurt your head also.  It makes us think, when they are reporting on issues we know little about, what are they telling us?  Probably more Fake News?   Seriously Globe, the mechanical refrigeration cycle involves a phase change, the ammonia doesn't "remain as a liquid in the system and turns to gas when released to athmosphere."  Ammonia is used because it doesn ZERO environmental damage and requires about 1/3 the energy for the same refrigeration effect as a freon system.  Stick with that Globe, it's as simple as that and you won't be tossing your credibility out the window giving us simpletons an erroneous technical talk about something you know little about and can't be bothered researching or verifying.   Red Seal Mechanic, I do agree with the education institutions wrongfully pushing the lesser educated into highly technical trades, but to be fair, it seems they get pushed into journalism as well!