What is heavy water and what is the chemical formula?

Deuterium oxide is a compound composed of deuterium and oxygen. The molecular formula is D2O, and its relative molecular weight is 20.0275, which is about 1 1% higher than that of water (H2O). In natural water, the content of heavy water accounts for about 0.0 15%. Because deuterium and hydrogen have little difference in properties, heavy water is similar to ordinary water. The ion product constant of heavy water is 1.6* 10- 15.

Heavy water (or deuterium water, chemical formula D2O or 2H2O) is a kind of water, and its mass is heavier than ordinary water. Ordinary water (H2O) consists of two hydrogen atoms, only protons and one oxygen atom 16. However, the two hydrogen isotopes in heavy water molecules each have one more neutron than ordinary hydrogen atoms, so the mass of heavy water molecules is heavier than ordinary water. In nature, the content of heavy water is very small.