Hi there! I am an engineering student and I have a project to do. It involves creating a heating/cooling system for our shoes. Well the instructoor asked us to choose a heating cool system so I chose this topic (assuming it would reach some where where I would get a patent for my hard work). So my design involves adding a thin layer (1cm ) under your shoe and inserting some capilaries through out the shoe's sides in order to take advantage of the capilary action of the liquid I am going to use. So I have a bulky system to use that is able to change the temperature of the meduim from 0.02 degrees to 100 degree according to the voltage applied and its polarity . I want the range to be between 5 degrees and 40 degrees. I do not know what is the bulky system is because did not do my lab yet but in 3 days I will tell you about it. So guys, what liquid should I use inorder to have a good system?