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Heavy Water - Thermophysical Properties

Thermodynamic properties of heavy water (D2O) like density, melting temperature, boiling temperature, latent heat of fusion, latent heat of evaporation, critical temperature and more.

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Heavy water ( deuterium oxide , ² H ₂ O , D ₂ O ) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (= heavy hydrogen = ² H = 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 - D ₂ O:

Boiling temperature (at 101.325 kPa): 101.40 ^o C = 214.52 °F
Bulk modulus elasticity (at 25°C): 2.10 x 10 ⁹ Pa or N/m ²
Critical density: 0.356 g/cm ³ = 0.691 slug/ft ³ = 3.457 lb _m /gal(US)
Critical pressure : 213.88 atm = 220.98 bar = 21.671 MPa (MN/m ² ) = 3143 psi (=lb _f /in ² )
Critical temperature : 370.697 ^o C = 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 ^o C): 1105.9 kg/m ³ = 2.1460 slug/ft ³ = 10.74048 lb _m /gal(US)
Melting temperature (at 101.325 kPa): 3.81 ^o C = 38.86 °F
Molar mass: 20.02751 g/mol
pD (~pH) (at 25°C): 7.43
Specific heat (C _p ) water (at 20°C): 4.219 kJ/kgK = 1.008 Btu(IT)/(lb _m °F) or kcal/(kg K)
Specific weight (at 11.23 ^o C): 10.8452 kN/m ³ = 69.0391 lb _f /ft ³
Surface tension (at 25°C): 71.87 dyn/cm
Triple point pressure: 0.00652 atm = 0.00661 bar = 661 Pa = 0.0959 psi (=lb _f /in ² )
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

Ionization Constant, pK _w , of normal and heavy water with varying temperature .

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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