I just saw a plaque for a cooking gas company that reads: “Afrox Handigas: Liquefied Petroleum Gas". Now with me being quite ignorant on chemistry, that plaque is pretty funny to me.As far as I know, petroleum is a liquid. So according to the plaque (and my mind), they took a liquid, gasified it and then liquefied it again. :? I know I’m probably wrong in finding it funny, but how does that work?