This is just kind of a question that crossed my mind as I was reading about custom loops. Why do we use water for liquid cooling? If we are trying to most effectively transfer heat from a cpu/gpu or any other component, why water, it has a very high specific heat? Why not use something like ethanol? It's specific heat is half of water's, and close to the same viscosity? Just a thought, and sorry if ethanol is used, I am new to custom loops.