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Re: Does heavy water ice sink or float in regular water?
A form of water in which the hydrogen atoms of mass 1 (1H) ordinarily present in water are replaced by deuterium (D or 2H), the heavy stable isotope of hydrogen of mass 2. The molecular formula of heavy water is D2O (or 2H2O). See also Deuterium.
Because the mass difference between 1H and 2H is the largest for any pair of stable (nonradioactive) isotopes in the periodic table, many of the physical and chemical properties of the pure isotopic species and their respective compounds differ to a significant extent. Selected physical properties of 1H2O and 2H2O are compared in the table.
Physical properties of ordinary and heavy water Property
1H2O
2H2O (D2O)
Molecular weight, 12C scale
18.015
20.028
Melting point, °C
0.00
3.81
Normal boiling point, °C
100.00
101.42
Temperature of maximum density, °C
3.98
11.23
Density at 25°C, g/cm3
0.99701
1.1044
Critical constants
Temperature, °C
374.1
371.1
Pressure, mPa
22.12
21.88
Volume, cm3/mol
55.3
55.0
Viscosity at 55°C, mPa · s
0.8903
1.107
Refractive index, nD20
1.3330
1.3283
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Re: Does heavy water ice sink or float in regular water?
