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Water - Thermal Diffusivity vs. Temperature and Pressure

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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 weight,  Dynamic and kinematic viscosity, Enthalpy and entropy, Heat of vaporization, Ionization Constant, pKw, of normal and heavy water, Melting points at high pressure, Prandtl number, Properties 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:



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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

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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

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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

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