A schematic diagram of a refrigerator is shown in the Appendix. The working of a refrigerator comprises of four major steps namely – evaporation, compression, condensation and expansion. A chemical called a refrigerant is used in this process to remove the heat from the refrigerator. Refrigerants must have certain specific properties – they must be easily liquefiable, they must have low specific heat capacities, they must be non-toxic, non-flammable and non-reactive with foodstuff etc. The first refrigerants used were ammonia, ether and chemo gene a mixture of petrol ether and naphtha.
However, nearly all were toxic, flammable and reactive. Thomas Midgley made a new species of compounds from fluorine called Chloro-Fluoro Carbons (CFC). They were non-toxic, non-flammable and removed large quantities of heat from the refrigerator and were ideal... [continues]
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