Vapour example sentences

Fumes are generally obtained by the condensation of vapours during sublimation, distillation, boiling and several other chemical reactions.For any pure liquid at atmospheric pressure ( 013 bar) the temperature at which the liquid and vapours are at equilibrium is called boiling point of the liquid.When the number of molecules leaving the liquid to vapour equals the number of molecules returning to the liquid from vapour, equilibrium is said to be attained and is dynamic in nature.However, this is not static equilibrium and there is a lot of activity at the boundary between the liquid and the vapour.When the water vapour cools down, it condenses and forms clouds.It is a mixture of many gases like nitrogen, oxygen, carbon dioxide and water vapour.You have seen how the water evaporates from the water bodies and subsequent condensation of this water vapour leads to rain.These gases react with the water vapour present in the atmosphere to form sulphuric acid and nitric acid.Water and water vapour are in equilibrium position at atmospheric pressure ( 013 bar) and at 100°C in a closed vessel.Water vapour is formed due to the heating of water bodies and the activities of living organisms.Hence solid iodine sublimes to give iodine vapour and the iodine vapour condenses to give solid iodine.It is found as ground water, as surface water in rivers and lakes and as water vapour in the atmosphere.Trees take in water from their roots and release water vapour into the air through evaporation.Some of the heat is trapped by gases such as carbon dioxide, methane, ozone, chlorofluorocarbon compounds (CFCs) and water vapour in the atmosphere.It gives rise to a constant vapour pressure because of an equilibrium in which the number of molecules leaving the liquid equals the number returning to liquid from the vapour.

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