EVERYDAY SCIENCE

Detailed explanation-1: -Heavy water (D2O) is a compound containing deuterium and oxygen. It is used in the atomic nuclear reactor as a moderator. It differs from ordinary water (H2O) only because it has Deuterium i.e. a heavy isotope of hydrogen.

Detailed explanation-2: -Heavy Water is used as a primary coolant to transport heat generated by the fission reaction to secondary coolant, light water.

Detailed explanation-3: -Heary water ( D20 ) also called deuterium oxide, water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen and oxygen. The heary water is used as a moderator of neutrons and also as a coolent in nuclear power plants.

Detailed explanation-4: -Heavy water has a density ten per cent greater than ordinary water. Its chemical composition is the same as that of ordinary water, two hydrogen atoms to one oxygen atom. Nor is there anything unusual about the oxygen atom. All the heaviness is due to the new kind of hydrogen discovered by Prof. H. C.

Detailed explanation-5: -The light-water reactor uses ordinary water, also called light water, as its neutron moderator. The light water absorbs too many neutrons to be used with unenriched natural uranium, and therefore uranium enrichment or nuclear reprocessing becomes necessary to operate such reactors, increasing overall costs.