: Because it is denser, ice cubes made of heavy water will sink in a glass of ordinary liquid water. 2. Primary Uses

Heavy water is approximately than ordinary water. Appearance : Colorless and odorless liquid. Freezing/Boiling Points : It freezes at ) and boils at

Heavy Water: A Manufacturers' Guide for the Hydrogen Century

Deuterium occurs naturally but is rare—only about hydrogen atoms in ocean water is deuterium.

Heavy water's most famous application is in the nuclear industry, but it serves several high-tech roles:

: It slows down neutrons in nuclear reactors without absorbing them. This allows reactors like the Canadian CANDU design to use natural uranium rather than expensive enriched uranium.