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# Heavy Water - Thermophysical Properties

Heavy water ( deuterium oxide , 2H2O , D2O ) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (= heavy hydrogen = 2H = D), rather than the common hydrogen-1 isotope ( 1 H = H = protium) that makes up most of the hydrogen in normal water.

Thermodynamic properties of heavy water - D2O:

• Boiling temperature (at 101.325 kPa):     101.40 oC = 214.52 °F
• Bulk modulus elasticity (at 25°C):              2.10 x 109 Pa or N/m2
• Critical density:                                         0.356 g/cm3 = 0.691 slug/ft3 = 3.457 lbm /gal(US)
• Critical pressure :                                      213.88 atm = 220.98 bar = 21.671 MPa (MN/m2) = 3143 psi (=lbf /in2)
• Critical temperature :                                 370.697 oC = 699.255 °F
• Ionization constant , pK w (at 25°C):          14.951
• Latent heat of evaporation (at 101.4°C):  41.521 KJ/mol = 2073.20 kJ/kg = 891.32 Btu(IT)/lb
• Latent heat of fusion:                               6.132 kJ/mol = 306.2 kJ/kg = 131.64 Btu(IT)/lb
• Maximum density (at 11.23 oC):               1105.9 kg/m3 = 2.1460 slug/ft3 = 10.74048 lbm /gal(US)
• Melting temperature (at 101.325 kPa):     3.81 oC = 38.86 °F
• Molar mass:                                              20.02751 g/mol
• pD (~pH) (at 25°C):                                  7.43
• Specific heat (Cp ) water (at 20°C):           4.219 kJ/kgK = 1.008 Btu(IT)/(lbm °F) or kcal/(kg K)
• Specific weight (at 11.23 oC):                   10.8452 kN/m3 = 69.0391 lbf /ft3
• Surface tension (at 25°C):                       71.87 dyn/cm
• Triple point pressure:                               0.00652 atm = 0.00661 bar = 661 Pa = 0.0959 psi (=lbf /in2)
• Triple point temperature:                          3.82 °C = 38.88 °F
• Vapor pressure (at 25°C):                        20.6 mmHg = 0.027 atm = 0.028 bar = 2750 Pa = 0.398 psi
• Viscosity (at 20°C):                                   1.251 cP or mPa s
.

See also more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Hydrogen sulfide , Methane , Methanol , Nitrogen , Oxygen , Pentane , Propane , Toluene and Water .

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