Heat and Thermodynamics

7.16 Effects of Chlorofliioro Carbons (CFCS) on Ozone Layer

Earth's atmosphere is a mixture of gases and vapours of which some are fixed components such as nitrogen, oxygen, argon, carbon dioxide, neon, krypton, hydrogen, nitrogen oxide, xenon and helium 3; and some are variable components like ozone, sulphur dioxide, nitrogen peroxide, methane and iodine. The atmosphere is divided into troposphere, stratosphere, thermosphere, ionosphere and magnetosphere according to height and their characteristics. The layer nearest to the earth's surface is called troposphere; it is about 17 km above equator, 9 km at latitude 50° and 6 km at poles. In this region, concentration of ozone is very small—nearly 0.02 parts per million in non-urban areas and less ...