Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
Chemical that lowers the freezing point of water (usually 0°C, 32 °F). It is put in the cooling system to prevent the expansion which water normally undergoes on freezing. It is often based on ethylene glycol.