Question: what is the difference between heavy water and light water?
Answer: Light water is basically “normal” water (H2O), while “heavy” water has deuterium-based water (D2O) added. ... Light water is basically “normal” water (H2O), while “heavy” water has deuterium-based water (D2O) added. Deuterium is a hydrogen atom that has one neutron and one proton as its nucleus.