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# Water - Thermal Diffusivity vs. Temperature and Pressure

## Figures and tables with thermal diffusivity of liquids and gaseous water at varying temperarures and pressures - SI and Imperial units.

Thermal diffusivity is the rate of transfer of heat of a material from the hot side to the cold side - a measure of how quickly a material can absorb heat from its surroundings. It can be calculated by taking the thermal conductivity divided by density and specific heat capacity at constant pressure.

Thermal diffusivity has the SI derived unit of [m²/s], and is usually denoted α but a, κ, K, and D are also used. The formula is:

α =k /(ρ CP)            [1]

where
k = is thermal conductivity [W/(m·K)]
ρ = density [kg/m³]
CP = specific heat capacity [J/(kg·K)]

Below, thermal diffusivity of water at varying temperatures and 1, 10 and 100 bara (14.5, 145 and 1450 psia) are given in figures and tables.

See Water and Heavy Water  for thermodynamic properties at standard condtions.
See also other properties of Water at varying temperature and pressure: Boiling points at high pressure, Boiling points at vacuum pressure, Density and specific weightDynamic and kinematic viscosity, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pKw, of normal and heavy water, Melting points at high pressure, Prandtl numberProperties at Gas-Liquid Equilibrium Conditions, Saturation pressure, Specific gravity, Specific heat (heat capacity), Specific volume, Thermal conductivity and Vapour pressure at gas-liquid equilibrium,

as well as thermal diffusivity of air, nitrogen and propane.

Water thermal diffusivity at atmospheric pressure, temperature given as °C or °F:

Water thermal diffusivity at 1, 10 and 100 bara (14.5, 145 and 1450 psia) pressure, temperature given as °C or °F:

Thermal diffusivity of water at atmospheric pressure and given temperature, SI and Imperial units:

For full table with Thermal Diffusivity - rotate the screen!

 State Temperature Thermal diffusivity Temperature Thermal diffusivity [K] [°C] [x10-6 m2/s] [m2/h] [K] [°F] [x10-6 ft2/s] [ ft2/h] Liquid 273 0 0.132 0.000474 273 32 1.42 0.00510 278 5 0.135 0.000486 278 40 1.45 0.00522 283 10 0.138 0.000497 283 50 1.48 0.00535 293 20 0.143 0.000515 297 75 1.56 0.00562 298 25 0.146 0.000524 311 100 1.62 0.00584 303 30 0.148 0.000532 325 125 1.67 0.00603 323 50 0.155 0.000558 339 150 1.72 0.00619 348 75 0.162 0.000584 353 175 1.76 0.00633 373 100 0.168 0.000603 366 200 1.79 0.00645 Gas 373 100 20.2 0.0728 394 250 251 0.905 398 125 24.0 0.0863 422 300 299 1.08 423 150 27.9 0.101 450 350 349 1.26 448 175 32.2 0.116 478 400 403 1.45 473 200 36.6 0.132 533 500 522 1.88 523 250 46.4 0.167 589 600 654 2.35 573 300 57.2 0.206 644 700 801 2.88 623 350 69.0 0.249 700 800 962 3.46 673 400 82.0 0.295 755 900 1137 4.09 773 500 111 0.400 811 1000 1327 4.78

Thermal diffusivity of water at given temperature and pressure, SI and Imperial units:

For full table  with Thermal Diffusivity - rotate the screen!

 State Temperature Pressure Thermal diffusivity [K] [°C] [°F] [MPa] [bara] [psia] [x10-6 m2/s] [x10-5 ft2/s] [ ft2/h] Liquid 273.16 0.01 32.02 0.1 1 14.5 0.1317 0.1418 0.005104 280 6.9 44.3 0.1 1 14.5 0.1362 0.1466 0.005277 300 26.9 80.3 0.1 1 14.5 0.1463 0.1575 0.005669 320 46.9 116 0.1 1 14.5 0.1540 0.1658 0.005968 340 66.9 152 0.1 1 14.5 0.1602 0.1724 0.006207 360 86.9 188 0.1 1 14.5 0.1651 0.1777 0.006397 372.756 99.61 211.3 0.1 1 14.5 0.1676 0.1804 0.006493 Gas 372.756 99.61 211.3 0.1 1 14.5 19.99 21.52 0.7748 380 107 224 0.1 1 14.5 21.20 22.82 0.8213 400 127 260 0.1 1 14.5 24.40 26.26 0.9454 450 177 350 0.1 1 14.5 32.67 35.16 1.266 500 227 440 0.1 1 14.5 41.79 44.99 1.619 550 277 530 0.1 1 14.5 51.98 55.95 2.014 600 327 620 0.1 1 14.5 63.30 68.14 2.453 650 377 710 0.1 1 14.5 75.77 81.55 2.936 700 427 800 0.1 1 14.5 89.36 96.19 3.463 750 477 890 0.1 1 14.5 104.1 112.0 4.032 800 527 980 0.1 1 14.5 119.8 129.0 4.644 900 627 1160 0.1 1 14.5 154.5 166.3 5.985 1000 727 1340 0.1 1 14.5 193.0 207.7 7.479 1100 827 1520 0.1 1 14.5 235.3 253.3 9.118 1200 927 1700 0.1 1 14.5 281.3 302.8 10.90 Liquid 273.16 0.01 32.02 1 10 145 0.1320 0.1420 0.00511 280 6.9 44.3 1 10 145 0.1364 0.1468 0.00528 300 26.9 80.3 1 10 145 0.1464 0.1576 0.00567 320 46.9 116 1 10 145 0.1541 0.1659 0.00597 340 66.9 152 1 10 145 0.1603 0.1726 0.00621 360 86.9 188 1 10 145 0.1652 0.1778 0.00640 380 107 224 1 10 145 0.1689 0.1818 0.00654 400 127 260 1 10 145 0.1713 0.1844 0.00664 450 177 350 1 10 145 0.1720 0.1852 0.00667 453.028 179.9 355.8 1 10 145 0.1718 0.1849 0.00666 Gas 453.028 179.9 355.8 1 10 145 2.495 2.686 0.0967 500 227 440 1 10 145 3.724 4.008 0.1443 550 277 530 1 10 145 4.884 5.258 0.1893 600 327 620 1 10 145 6.089 6.554 0.2359 650 377 710 1 10 145 7.379 7.942 0.2859 700 427 800 1 10 145 8.770 9.440 0.3398 750 477 890 1 10 145 10.27 11.05 0.3978 800 527 980 1 10 145 11.87 12.77 0.4599 900 627 1160 1 10 145 15.38 16.55 0.5959 1000 727 1340 1 10 145 19.28 20.75 0.7471 1100 827 1520 1 10 145 23.56 25.36 0.9129 1200 927 1700 1 10 145 28.20 30.35 1.093 Liquid 273.16 0.01 32.018 10 100 1450 0.1343 0.1446 0.00520 280 6.9 44.3 10 100 1450 0.1384 0.1489 0.00536 300 26.9 80.3 10 100 1450 0.1479 0.1592 0.00573 320 46.9 116 10 100 1450 0.1554 0.1673 0.00602 340 66.9 152 10 100 1450 0.1615 0.1739 0.00626 360 86.9 188 10 100 1450 0.1665 0.1792 0.00645 380 107 224 10 100 1450 0.1702 0.1832 0.00660 400 127 260 10 100 1450 0.1728 0.1860 0.00670 450 177 350 10 100 1450 0.1741 0.1874 0.00675 500 227 440 10 100 1450 0.1676 0.1804 0.00649 550 277 530 10 100 1450 0.1507 0.1623 0.00584 584.147 311.00 591.79 10 100 1450 0.1270 0.1367 0.00492 Gas 584.147 311.00 591.79 10 100 1450 0.1978 0.2129 0.00767 600 327 620 10 100 1450 0.2826 0.3042 0.01095 650 377 710 10 100 1450 0.4966 0.5346 0.01924 700 427 800 10 100 1450 0.6889 0.7415 0.02669 750 477 890 10 100 1450 0.8766 0.9436 0.03397 800 527 980 10 100 1450 1.068 1.149 0.04137 900 627 1160 10 100 1450 1.472 1.584 0.05702 1000 727 1340 10 100 1450 1.911 2.057 0.07403 1100 827 1520 10 100 1450 2.385 2.567 0.09242 1200 927 1700 10 100 1450 2.894 3.115 0.1121

Unit conversion thermal diffusivity:

square feet/second [ft2/s], square feet/hour [ft2/h], square meter/hour [m2/h], square meter/second [m2/s]

• 1 ft2/h = 2.7778x10-4 ft2/s = 0.09290 m2/h = 2.581x10-5 m2/s
• 1 ft2/s = 3600 ft2/h = 334.45 m2/h = 0.09290 m2/s
• 1 m2/h = 2.7778x10-4 m2/s = 10.7639 ft2/h = 0.002990 ft2/s
• 1 m2/s = 3600 m2/h = 38750.1 ft2/h = 10.7639 ft2/s

## Related Topics

• Thermodynamics - Thermodynamics of steam and condensate systems.
• Fluid Mechanics - The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.
• Material Properties - Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
• Steam and Condensate - Steam & condensate systems- properties, capacities, pipe sizing, systems configuration and more.
• Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more.
• Thermodynamics - Work, heat and energy systems.

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