Faraday Paper

Michael Faraday was a scientist in 19th century whose experiments with chlorine and ammonia led to the invention/discovery of refrigeration. He conducted an experiment with Chlorine Hydrate, which entailed putting it into a sealed glass tube in the shape of a "v" with one end in a hot water bath and the other end in an ice bath. This allowed him to liquefy chlorine from the solidified chlorine in addition to the production of the chlorine gas.