Explanation

The freezing point of heavy water is 3.82°C:

| | Heavy water (D2O) | Regular water |

|---|---|---|

| Freezing point | 3.82°C | 0°C |

| Boiling point | 101.42°C | 100°C | 

Heavy water is made up of two deuterium atoms and one oxygen atom.

It contains more deuterium, a hydrogen isotope, than regular water, which contains hydrogen-1.

Heavy water is used in reaction mechanisms.

It is is prepared by electrolyzing water.