Refrigerant-12 and related CFCs, Refrigerant-11 and Refrigerant-22, are currently the major compounds used in the cooling and insulation systems of home refrigeration units. It has been found, however, that CFCs are posing a major threat to the global environment through their role in the destruction of the ozone layer. A search has therefore begun for replacements, and some manufacturers of CFCs have already pledged to phase out these products by the end of the century.
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Atomic clock, electric or electronic timekeeping device that is controlled by atomic or molecular oscillations. A timekeeping device must co...
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Forestry is the art and science of managing forests, tree plantations , and related natural resources. The main goal of forestry is to crea...
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Anatomy (Greek anatomē, “dissection”), branch of natural science dealing with the structural organization of living things. It is an old sc...