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# Nitrogen - 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 C P )            [1]

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

Below, thermal diffusivity of nitrogen at varying temperatures and 1, 10, 50 and 100 bara (14.5, 145, 725 and 1450 psia) are given in figures and tables .

See also other properties of Nitrogen at varying temperature and pressure : Density and specific weight , Dynamic and kinematic viscosity , Prandtl number , Specific heat (Heat capacity) and Thermal conductivity , and thermophysical properties at standard conditions ,
as well as thermal diffusivity of air , propane and water .

Nitrogen phase diagram

Thermal diffusivity of nitrogen at 1, 10, 50 and 100 bara (14.5, 145, 725 and 1450 psia), and varying temperature given as °C or °F:

Thermal diffusivity of nitrogen at gas-liquid equilibrium pressure and varying temperature given as °C or °F:

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

 Temperature Thermal diffusivity Temperature Thermal diffusivity [K] [°C] [x10 -6 m 2 /s] [m 2 /h] [K] [°F] [x10 -5 ft 2 /s] [ ft 2 /h] 78 -195 1.489 0.00536 78 -320 1.577 0.05679 98 -175 2.447 0.00881 89 -300 2.118 0.07626 123 -150 3.934 0.01416 116 -250 3.775 0.1359 148 -125 5.727 0.02062 144 -200 5.843 0.2103 173 -100 7.807 0.02811 172 -150 8.298 0.2987 198 -75 10.16 0.03658 200 -100 11.11 0.4001 223 -50 12.77 0.04597 228 -50 14.27 0.5137 231 -42 13.65 0.04916 231 -44 14.67 0.5281 248 -25 15.62 0.05622 244 -20 16.32 0.5874 263 -10 17.44 0.06277 255 0 17.74 0.6387 268 -5 18.06 0.06501 266 20 19.21 0.6917 278 5 19.33 0.06960 278 40 20.73 0.7464 283 10 19.98 0.07193 283 50 21.51 0.7743 293 20 21.30 0.07670 294 70 23.09 0.8313 298 25 21.98 0.07912 300 80 23.90 0.8604 303 30 22.66 0.08158 305 90 24.72 0.8899 323 50 25.46 0.09167 311 100 25.55 0.9198 348 75 29.14 0.1049 339 150 29.85 1.074 373 100 32.99 0.1187 366 200 34.38 1.238 398 125 37.00 0.1332 394 250 39.14 1.409 423 150 41.16 0.1482 422 300 44.10 1.588 448 175 45.47 0.1637 478 400 54.59 1.965 473 200 49.91 0.1797 533 500 65.75 2.367 573 300 68.88 0.2480 644 700 89.74 3.231 623 350 78.99 0.2844 700 800 102.5 3.689 673 400 89.46 0.3221 755 900 115.6 4.163 773 500 111.4 0.4011 811 1000 129.2 4.652

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

 State Temperature Pressure Thermal diffusivity [K] [°C] [°F] [bara] [psia] [*10 -6 m 2 /s] [m 2 /h] [x10 -5 ft 2 /s] [ ft 2 /h] Liquid at equilibrium 63.15 -210.0 -346.0 0.125 1.82 0.09987 3.60E-04 0.1075 0.00387 69 -204 -335 0.332 4.82 0.09523 3.43E-04 0.1025 0.00369 75 -198 -325 0.760 11.0 0.09011 3.24E-04 0.09699 0.00349 79 -194 -317 1.22 17.8 0.08644 3.11E-04 0.09304 0.00335 85 -188 -307 2.29 33.2 0.08053 2.90E-04 0.08668 0.00312 89 -184 -299 3.31 47.9 0.07624 2.74E-04 0.08206 0.00295 95 -178 -289 5.41 78.4 0.06918 2.49E-04 0.07447 0.00268 99 -174 -281 7.26 105 0.06401 2.30E-04 0.06890 0.00248 105 -168 -271 10.8 157 0.05539 1.99E-04 0.05962 0.00215 109 -164 -263 13.8 201 0.04891 1.76E-04 0.05265 0.00190 115 -158 -253 19.4 281 0.03766 1.36E-04 0.04054 0.00146 121 -152 -242 26.4 383 0.02302 8.29E-05 0.02478 0.00089 Gas at equilibrium 63.15 -210.0 -346.0 0.125 1.82 7.877 0.02836 8.478 0.30523 69 -204 -335 0.332 4.82 3.506 0.01262 3.774 0.13585 75 -198 -325 0.760 11.0 1.763 0.00635 1.897 0.06830 79 -194 -317 1.22 17.8 1.182 0.00426 1.273 0.04582 85 -188 -307 2.29 33.2 0.6937 0.00250 0.7467 0.02688 89 -184 -299 3.31 47.9 0.5022 0.00181 0.5406 0.01946 95 -178 -289 5.41 78.4 0.3198 0.00115 0.3442 0.01239 99 -174 -281 7.26 105 0.2398 8.63E-04 0.2581 0.00929 105 -168 -271 10.8 157 0.1562 5.62E-04 0.1681 0.00605 109 -164 -263 13.8 201 0.1159 4.17E-04 0.1248 0.00449 115 -158 -253 19.4 281 0.06909 2.49E-04 0.07437 0.00268 121 -152 -242 26.4 383 0.03166 1.14E-04 0.03407 0.00123 Liquid 63.17 -210.0 -346.0 1 14.5 0.09991 3.60E-04 0.1075 0.00387 77.24 -195.9 -320.6 1 14.5 0.08808 3.17E-04 0.09481 0.00341 Gas 77.24 -195.9 -320.6 1 14.5 1.402 0.00505 1.509 0.05433 80 -193.2 -315.7 1 14.5 1.529 0.00550 1.645 0.05923 100 -173.2 -279.7 1 14.5 2.548 0.00917 2.743 0.09875 120 -153.2 -243.7 1 14.5 3.754 0.01352 4.041 0.1455 140 -133.2 -207.7 1 14.5 5.151 0.01854 5.544 0.1996 160 -113.2 -171.7 1 14.5 6.721 0.02420 7.234 0.2604 180 -93.2 -135.7 1 14.5 8.464 0.03047 9.110 0.3280 200 -73.2 -99.7 1 14.5 10.38 0.03738 11.18 0.4023 220 -53.2 -63.7 1 14.5 12.44 0.04478 13.39 0.4820 240 -33.2 -27.7 1 14.5 14.67 0.05282 15.79 0.5685 260 -13.2 8.3 1 14.5 17.03 0.06129 18.33 0.6598 280 6.9 44.3 1 14.5 19.56 0.07040 21.05 0.7578 300 26.9 80.3 1 14.5 22.21 0.07997 23.91 0.8608 320 46.9 116.3 1 14.5 24.96 0.08987 26.87 0.9673 340 66.9 152.3 1 14.5 27.88 0.1004 30.01 1.080 360 86.9 188.3 1 14.5 30.89 0.1112 33.25 1.197 400 126.9 260.3 1 14.5 37.28 0.1342 40.13 1.445 500 226.9 440.3 1 14.5 54.88 0.1976 59.08 2.127 600 326.9 620.3 1 14.5 74.31 0.2675 79.99 2.880 700 426.9 800.3 1 14.5 95.24 0.3429 102.5 3.691 800 526.9 980.3 1 14.5 117.5 0.4231 126.5 4.554 900 626.9 1160.3 1 14.5 141.1 0.5081 151.9 5.469 1000 726.9 1340.3 1 14.5 166.3 0.5986 179.0 6.444 Liquid 63.37 -210 -346 10 145 0.1003 3.61E-04 0.1079 0.00388 80 -193 -316 10 145 0.08632 3.11E-04 0.09292 0.00334 100 -173 -280 10 145 0.06318 2.27E-04 0.06800 0.00245 103.8 -169.4 -272.9 10 145 0.05728 2.06E-04 0.06166 0.00222 Gas 103.8 -169.4 -272.9 10 145 0.1710 6.15E-04 0.1840 0.00662 140.0 -133.2 -207.7 10 145 0.4573 0.00165 0.4922 0.01772 160 -113 -172 10 145 0.6261 0.00225 0.6739 0.02426 180 -93 -136 10 145 0.8087 0.00291 0.8704 0.03134 200 -73.2 -99.7 10 145 1.007 0.00363 1.084 0.03903 240 -33.2 -27.7 10 145 1.448 0.00521 1.559 0.05613 300 26.9 80.3 10 145 2.218 0.00798 2.387 0.08593 400 127 260 10 145 3.730 0.01343 4.015 0.1445 500 227 440 10 145 5.489 0.01976 5.908 0.2127 600 327 620 10 145 7.464 0.02687 8.035 0.2892 800 527 980 10 145 11.76 0.04232 12.65 0.4555 1100 827 1520 10 145 19.35 0.06966 20.83 0.7498 1600 1327 2420 10 145 35.06 0.1262 37.74 1.359 Liquid 100 -173 -280 50 725 0.07101 2.56E-04 0.07643 0.00275 Supercritical phase 600 327 620 50 725 1.529 0.00550 1.646 0.05925 1100 827 1520 50 725 3.933 0.01416 4.233 0.1524 1600 1327 2420 50 725 7.093 0.02553 7.635 0.2748 Liquid 65.32 -208 -342 100 1450 0.1035 3.73E-04 0.1114 0.00401 80 -193 -316 100 1450 0.09376 3.38E-04 0.1009 0.00363 100 -173 -280 100 1450 0.07813 2.81E-04 0.084 0.00303 Supercritical phase 200 -73.2 -99.7 100 1450 0.09050 3.26E-04 0.097 0.00351 300 26.9 80.3 100 1450 0.2333 8.40E-04 0.2511 0.00904 400 127 260 100 1450 0.4001 0.00144 0.4307 0.01550 500 227 440 100 1450 0.5882 0.00212 0.6331 0.02279 600 327 620 100 1450 0.7922 0.00285 0.8527 0.03070 1100 827 1520 100 1450 2.008 0.00723 2.162 0.07782 1600 1327 2420 100 1450 3.598 0.01295 3.873 0.1394

Unit conversion thermal diffusivity:

square feet/second [ft 2 /s], square feet/hour [ft 2 /h], square meter/hour [m 2 /h], square meter/second [m 2 /s]

• 1 ft 2 /h = 2.7778x10 -4 ft 2 /s = 0.09290 m 2 /h = 2.581x10 -5 m 2 /s
• 1 ft 2 /s = 3600 ft 2 /h = 334.45 m 2 /h = 0.09290 m 2 /s
• 1 m 2 /h = 2.7778x10 -4 m 2 /s = 10.7639 ft 2 /h = 0.002990 ft 2 /s
• 1 m 2 /s = 3600 m 2 /h = 38750.1 ft 2 /h = 10.7639 ft 2 /s

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