Imagine this: it is a very hot day in July, you are watching T.V, your movements are as if you were a robot. Your fingers of your right hand are looking for a channel that gets your attention, and you found it. You have a comfortable posture in the couch, the windows open and fresh air coming through it. The T.V continues with the program until is commercial time. The commercial starts normal, then it shows a cool drink and suddenly you are thirsty. You get up and head to the refrigerator, you open it, and you got a really cold Coca-Cola. This past 200 years we have seen the big effect that ice had in our lives. It everything started as a theory, and idea, of Dr. Cullen, which the one consisted on the cooling effects of liquids evaporating in a vacuum. Then a lot more people started experimenting with this “cooling” theory. Even if he invented, he didn’t created, he just came up with the idea. Here I am going to tell you how this four scientists had revolutionized the refrigerator to how we use it today. But first let me tell you how the people did to storage their foods before the refrigerator. Do you remember the first example? Well you would said, that’s really easy, nothing to worry about. But imagine if you didn’t have the refrigerator. How would you have fresh food? How would you storage it? How would you be able to get a really cold cup of ice cream? Well we would suffer if the refrigerator wouldn’t exist. We are so dependent on the electricity and new technology that if something happened we would be lost. If we go back 250, or at least 300, we would notice that the people handled this situations whit the recourses that they could get. The people of those days used snow from the mountains and transported to their houses to later contain it in insulated material. They sometimes stored like the milk and butter in cellars, or underwater in the near lakes. Or to cool down their drinks the Egyptians placed their liquid in container open and in the ceiling to let the night air cool it. In 1805, Oliver Evans came up with an idea to create colder temperatures by the evaporation of liquids in a vacuum. He did this but never created a model to prove it. Later on in 1834 Jacob Perkins did create the first Ether Ice Machine, with the ether vapour compression cycle. According to “Perkins' patent, liquid ether was contained in an "evaporator vessel" where it was vaporized under a partial vacuum maintained by the suction of a crude hand-operated compressor. The evaporator vessel was submerged in a liquid from which the heat required to vaporize the ether was extracted, thereby cooling the liquid. The compressed ether vapor from the compressor discharge was then condensed back into liquid ether by flowing through piping coils submerged in water. The liquid ether then returned through a pressure reduction valve into the partial vacuum of the evaporator vessel. Clearly, Perkins' system included the four principal features uses by modern vapor-compression refrigeration systems, namely an evaporator, a compressor, a condenser and an expansion valve. Unfortunately, Perkins had no success in commercializing his system.”