Fog machines work by heating up a mixture of water and glycerine in a heat exchanger. I'm wondering why the fog that comes out of a fog machine isn't hot even if the nozzle a few hundred degrees fahrenheit. To get from a liquid to a gas state it has to get more energy (heat) right? Does it just get enough energy to get to a gas and then cools from the surrounding air? This has been bothering me for a few days so thought someone would have some good input here.