Before mechanical refrigeration systems were introduced, people cooled their food with ice and snow, either found locally or b

... Refrigeration is defined as "The process of removing heat from an enclosed space, or from a substance, to lower its pressure." (First website given in bibliography) In simpler terms, it is removing heat from states of matter in order to keep them cooler. The basic need for refrigeration is to cool food and beverages, as they often get spoilt if the temperature is high. Before actual refrigerators and other such mechanical systems were introduced, it was very common for people to cool their food with ice and snow. These materials were either gathered from the mountains, or were provided locally. For most of history, cellars were holes dug into the ground, covered with ice and lined with either wood or straw. The first known artificial system of refrigeration was demonstrated by William Cullen in 1805; however, he did not use it for any practical purpose. It was not till later when

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