Water - Thermal Diffusivity vs. Temperature and Pressure
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:
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) | (×10-6 m2/s) | (m2/h) | (K) | (°F) | (×10-6 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) | (×10-6 m2/s) | (×10-5ft2/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 = 2.7778×10-4 ft2/s = 0.09290 m2/h = 2.581×10-5m2/s
- 1 ft2/s = 3600 ft2/h = 334.45 m2/h = 0.09290 m2/s
- 1 m2/h = 2.7778×10-4 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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