Enthalpy of Gases

The following have been derived from the best available data, using spectroscopic values. Historically, tables of heat capacities have been used for deriving heat contents, but since these are invariably integrated with respect to temperature, it is more convenient to tabulate the integrals themselves. Formulae for these functions are extremely complex and unweildy (Note 1), and for modelling purposes it is best to use the table to derive simpler equations over the range of interest. For convenience, all values are related to the state at 0°C. Values are in kJ/kg at a pressure of 101.325 kPa. The air and de-oxygenated air compositions are those for air at 50% humidity as defined in the Air Composition page. H2O, CO2 and SO2 are all subject to decomposition at the top end of the temperature range, but because the extent of this is a function of their partial pressure, this is not accounted for here.

°CN2O2ArAirAir-O2H2OCO2COSO2H2
M28.0137131.9988039.9480028.8683828.0478618.0153544.0098028.0104064.066302.01595
-20-20.79-18.27-10.41-20.16-20.73-37.13-16.16-20.80-12.06-284.3
-15-15.59-13.70-7.81-15.12-15.55-27.85-12.16-15.60-9.06-213.4
-10-10.39-9.14-5.20-10.08-10.37-18.57-8.13-10.40-6.06-142.3
-5-5.20-4.57-2.60-5.04-5.18-9.29-4.08-5.20-3.03-71.2
00.000.000.000.000.000.000.000.000.000.0
55.204.572.605.045.189.304.105.203.0571.3
1010.399.155.2010.0910.3718.608.2310.406.11142.6
1515.5913.737.8015.1315.5527.9112.3915.609.19214.0
2020.7918.3110.4120.1720.7337.2216.5720.8012.28285.4
2525.9922.8913.0125.2225.9246.5520.7726.0015.39356.9
3031.1927.4815.6130.2731.1055.8725.0031.2018.50428.5
3536.3832.0818.2135.3236.2965.2129.2636.4121.64500.1
4041.5836.6720.8140.3741.4774.5533.5441.6124.79571.7
4546.7841.2823.4245.4246.6683.9037.8546.8127.95643.5
5051.9845.8826.0250.4751.8493.2642.1852.0231.12715.2
5557.1950.5028.6255.5357.03102.6346.5357.2334.31787.1
6062.3955.1131.2260.5962.22112.0050.9162.4437.52858.9
6567.5959.7433.8365.6467.41121.3855.3267.6540.74930.8
7072.8064.3736.4370.7172.60130.7759.7472.8643.971002.8
7578.0069.0039.0375.7777.79140.1764.1978.0747.211074.8
8083.2173.6441.6380.8382.98149.5868.6783.2950.471146.8
8588.4178.2844.2385.9088.18159.0073.1788.5053.751218.9
9093.6282.9446.8490.9793.37168.4277.6993.7257.041291.0
9598.8387.5949.4496.0498.57177.8682.2398.9460.341363.1
100104.0492.2652.04101.12103.77187.3086.79104.1663.651435.3
105109.2596.9354.64106.20108.97196.7691.38109.3966.981507.5
110114.47101.6157.25111.28114.17206.2295.99114.6270.321579.8
115119.68106.2959.85116.36119.37215.70100.63119.8573.681652.1
120124.90110.9862.45121.45124.57225.19105.28125.0877.051724.4
125130.12115.6865.05126.54129.78234.68109.95130.3180.431796.7
130135.34120.3967.65131.63134.99244.19114.65135.5583.831869.1
135140.57125.1070.26136.72140.20253.72119.37140.7987.241941.5
140145.79129.8272.86141.82145.41263.25124.11146.0490.662014.0
145151.02134.5575.46146.93150.63272.80128.86151.2894.092086.4
150156.25139.2878.06152.03155.84282.36133.64156.5497.542158.9
155161.48144.0280.66157.14161.06291.93138.44161.79101.002231.4
160166.72148.7883.27162.26166.29301.52143.26167.05104.472303.9
165171.95153.5385.87167.37171.51311.12148.10172.31107.952376.5
170177.19158.3088.47172.50176.74320.73152.95177.58111.452449.0
175182.44163.0791.07177.62181.97330.36157.83182.85114.962521.6
180187.68167.8593.67182.75187.20340.00162.73188.12118.482594.2
185192.93172.6496.28187.88192.44349.66167.64193.40122.012666.8
190198.19177.4498.88193.02197.68359.33172.58198.68125.562739.5
195203.44182.25101.48198.16202.92369.01177.53203.97129.112812.1
200208.70187.06104.08203.31208.17378.70182.50209.26132.682884.8
205213.96191.88106.68208.46213.42388.41187.49214.55136.262957.4
210219.23196.71109.29213.62218.67398.13192.50219.85139.853030.1
215224.50201.54111.89218.78223.93407.87197.52225.15143.463102.8
220229.77206.39114.49223.94229.19417.62202.56230.46147.073175.5
225235.04211.24117.09229.11234.45427.38207.62235.78150.703248.2
230240.32216.10119.70234.29239.72437.16212.70241.09154.333320.9
235245.61220.97122.30239.46244.99446.95217.80246.42157.983393.6
240250.90225.84124.90244.65250.27456.76222.91251.75161.643466.3
245256.19230.73127.50249.84255.55466.57228.04257.08165.313539.0
250261.48235.62130.10255.03260.83476.41233.18262.42168.993611.7
255266.79240.52132.70260.23266.12486.27238.34267.76172.673684.5
260272.09245.43135.31265.44271.42496.14243.51273.12176.373757.2
265277.40250.34137.91270.65276.72506.03248.69278.47180.083829.9
270282.72255.27140.51275.86282.02515.93253.90283.84183.803902.6
275288.04260.20143.11281.08287.33525.85259.12289.20187.533975.3
280293.36265.14145.72286.31292.64535.78264.35294.58191.264048.0
285298.69270.08148.32291.54297.96545.73269.60299.96195.014120.8
290304.03275.04150.92296.78303.28555.69274.86305.34198.774193.5
295309.37280.00153.52302.02308.61565.67280.14310.74202.534266.2
300314.71284.97156.12307.27313.94575.66285.44316.13206.314338.9
305320.06289.95158.73312.53319.28585.67290.74321.54210.094411.6
310325.41294.93161.33317.79324.62595.70296.07326.95213.894484.4
315330.77299.92163.93323.05329.97605.73301.40332.36217.694557.1
320336.14304.92166.53328.32335.32615.79306.75337.79221.504629.9
325341.51309.93169.13333.60340.68625.86312.12343.21225.324702.6
330346.88314.95171.74338.88346.04635.94317.50348.65229.154775.4
335352.26319.97174.34344.17351.41646.05322.89354.09232.994848.1
340357.65325.00176.94349.47356.78656.16328.30359.54236.834920.9
345363.04330.04179.54354.77362.16666.30333.72364.99240.684993.7
350368.44335.08182.15360.08367.55676.44339.15370.45244.555066.4
355373.84340.13184.75365.39372.94686.61344.59375.92248.415139.2
360379.25345.19187.35370.71378.34696.79350.05381.39252.295212.0
365384.67350.25189.95376.03383.74706.99355.53386.87256.185284.9
370390.09355.33192.56381.36389.15717.20361.01392.36260.075357.7
375395.51360.41195.16386.70394.56727.43366.51397.85263.975430.5
380400.94365.49197.76392.04399.98737.67372.02403.35267.885503.4
385406.38370.59200.36397.39405.40747.93377.54408.86271.795576.2
390411.82375.69202.96402.75410.84758.21383.08414.37275.725649.1
395417.27380.80205.57408.11416.27768.51388.63419.89279.655722.0
400422.73385.91208.17413.48421.72778.82394.19425.42283.585794.9
405428.19391.03210.77418.85427.16789.14399.76430.95287.535867.8
410433.66396.16213.37424.23432.62799.48405.35436.49291.485940.8
415439.13401.29215.98429.61438.08809.84410.94442.03295.436013.7
420444.61406.43218.58435.01443.55820.22416.55447.59299.406086.7
425450.09411.58221.18440.40449.02830.61422.17453.15303.376159.7
430455.58416.73223.78445.81454.50841.02427.80458.71307.356232.7
435461.08421.89226.38451.22459.98851.45433.45464.28311.336305.7
440466.58427.06228.99456.63465.47861.89439.10469.86315.326378.7
445472.09432.23231.59462.05470.97872.35444.77475.45319.326451.8
450477.61437.41234.19467.48476.47882.83450.45481.04323.326524.9
455483.13442.60236.79472.92481.98893.32456.13486.64327.336598.0
460488.65447.79239.40478.36487.49903.83461.83492.24331.346671.1
465494.19452.98242.00483.80493.01914.35467.54497.85335.366744.3
470499.73458.19244.60489.25498.54924.90473.27503.47339.396817.4
475505.27463.40247.20494.71504.07935.46479.00509.10343.426890.6
480510.82468.61249.80500.17509.61946.04484.74514.73347.466963.8
485516.38473.83252.41505.64515.15956.63490.49520.37351.507037.1
490521.94479.06255.01511.12520.70967.24496.26526.01355.557110.3
495527.51484.29257.61516.60526.26977.87502.03531.66359.617183.6
500533.09489.53260.21522.09531.82988.52507.82537.32363.677256.9
505538.67494.77262.82527.58537.39999.18513.61542.98367.747330.3
510544.25500.02265.42533.08542.971009.86519.41548.65371.817403.6
515549.85505.28268.02538.59548.551020.56525.23554.33375.887477.0
520555.45510.54270.62544.10554.131031.27531.05560.01379.977550.4
525561.05515.80273.22549.62559.731042.00536.89565.70384.057623.9
530566.66521.08275.83555.14565.321052.75542.73571.39388.157697.3
535572.28526.35278.43560.67570.931063.52548.59577.09392.247770.8
540577.90531.63281.03566.21576.541074.30554.45582.80396.347844.4
545583.53536.92283.63571.75582.161085.10560.32588.51400.457917.9
550589.17542.21286.24577.29587.781095.92566.21594.23404.567991.5
555594.81547.51288.84582.84593.411106.76572.10599.96408.688065.1
560600.45552.81291.44588.40599.041117.61578.00605.69412.808138.8
565606.11558.12294.04593.97604.681128.48583.91611.43416.938212.5
570611.76563.44296.64599.53610.321139.37589.83617.17421.068286.2
575617.43568.75299.25605.11615.981150.28595.76622.92425.198359.9
580623.10574.08301.85610.69621.631161.20601.69628.68429.338433.7
585628.77579.40304.45616.28627.301172.14607.64634.44433.478507.5
590634.46584.74307.05621.87632.971183.10613.59640.21437.628581.4
595640.14590.07309.66627.46638.641194.08619.56645.99441.788655.2
600645.84595.41312.26633.07644.321205.07625.53651.77445.938729.1
605651.54600.76314.86638.67650.011216.08631.51657.55450.098803.1
610657.24606.11317.46644.29655.701227.11637.50663.34454.268877.1
615662.95611.47320.06649.91661.401238.16643.50669.14458.438951.1
620668.67616.83322.67655.53667.101249.22649.50674.94462.609025.1
625674.39622.19325.27661.16672.811260.30655.51680.75466.789099.2
630680.12627.56327.87666.80678.531271.40661.54686.57470.969173.3
635685.85632.93330.47672.44684.251282.52667.57692.39475.159247.5
640691.59638.31333.07678.08689.971293.65673.60698.22479.349321.7
645697.34643.69335.68683.74695.701304.81679.65704.05483.539395.9
650703.09649.08338.28689.39701.441315.98685.70709.89487.739470.2
655708.84654.47340.88695.05707.181327.17691.77715.73491.939544.5
660714.60659.87343.48700.72712.931338.37697.83721.58496.139618.9
665720.37665.27346.09706.39718.691349.60703.91727.43500.349693.3
670726.14670.67348.69712.07724.451360.84710.00733.29504.559767.7
675731.92676.08351.29717.75730.211372.10716.09739.16508.769842.2
680737.70681.49353.89723.44735.981383.38722.19745.03512.989916.7
685743.49686.90356.49729.13741.761394.67728.29750.90517.219991.3
690749.29692.32359.10734.83747.541405.99734.41756.78521.4310065.9
695755.09697.75361.70740.53753.321417.32740.53762.67525.6610140.5
700760.89703.17364.30746.24759.121428.67746.66768.56529.8910215.2
705766.70708.60366.90751.96764.911440.03752.79774.46534.1310289.9
710772.52714.04369.50757.67770.721451.42758.94780.36538.3710364.7
715778.34719.48372.11763.40776.521462.82765.09786.27542.6110439.5
720784.16724.92374.71769.12782.341474.24771.24792.18546.8610514.3
725789.99730.36377.31774.86788.161485.68777.41798.10551.1110589.2
730795.83735.81379.91780.59793.981497.14783.58804.02555.3610664.2
735801.67741.27382.52786.34799.811508.61789.75809.95559.6110739.1
740807.52746.72385.12792.08805.641520.10795.94815.88563.8710814.2
745813.37752.18387.72797.83811.481531.61802.13821.82568.1310889.2
750819.23757.65390.32803.59817.321543.14808.32827.77572.4010964.4
755825.09763.12392.92809.35823.171554.69814.53833.71576.6611039.5
760830.95768.59395.53815.12829.031566.25820.74839.67580.9311114.7
765836.83774.06398.13820.89834.891577.83826.95845.62585.2111190.0
770842.70779.54400.73826.66840.751589.43833.18851.59589.4811265.3
775848.58785.02403.33832.44846.621601.05839.40857.55593.7611340.6
780854.47790.50405.93838.23852.491612.69845.64863.53598.0511416.0
785860.36795.99408.54844.02858.371624.34851.88869.50602.3311491.5
790866.26801.48411.14849.81864.251636.01858.13875.48606.6211567.0
795872.16806.98413.74855.61870.141647.70864.38881.47610.9111642.5
800878.06812.47416.34861.41876.041659.41870.64887.46615.2011718.1
805883.98817.97418.94867.21881.931671.13876.91893.46619.5011793.7
810889.89823.48421.55873.03887.841682.88883.18899.46623.8011869.4
815895.81828.98424.15878.84893.741694.64889.46905.46628.1011945.1
820901.74834.49426.75884.66899.661706.42895.74911.47632.4012020.9
825907.67840.01429.35890.48905.571718.21902.03917.48636.7112096.7
830913.60845.52431.96896.31911.501730.03908.32923.50641.0212172.6
835919.54851.04434.56902.15917.421741.86914.62929.53645.3312248.6
840925.48856.57437.16907.98923.351753.71920.93935.55649.6412324.5
845931.43862.09439.76913.82929.291765.58927.24941.58653.9612400.6
850937.38867.62442.36919.67935.231777.46933.56947.62658.2812476.7
855943.34873.15444.97925.52941.171789.37939.88953.66662.6012552.8
860949.30878.68447.57931.37947.121801.29946.21959.70666.9212629.0
865955.27884.22450.17937.23953.071813.23952.55965.75671.2512705.2
870961.24889.76452.77943.09959.031825.18958.89971.80675.5812781.5
875967.21895.30455.37948.96965.001837.16965.23977.86679.9112857.8
880973.19900.85457.98954.83970.961849.15971.58983.92684.2412934.2
885979.18906.39460.58960.70976.931861.16977.94989.99688.5813010.7
890985.16911.94463.18966.58982.911873.19984.30996.06692.9213087.2
895991.16917.50465.78972.46988.891885.23990.661002.13697.2613163.7
900997.15923.05468.38978.34994.871897.30997.031008.21701.6013240.3
9051003.15928.61470.99984.231000.861909.381003.411014.29705.9513317.0
9101009.16934.17473.59990.131006.851921.481009.791020.37710.2913393.7
9151015.17939.74476.19996.031012.851933.591016.181026.46714.6413470.4
9201021.18945.30478.791001.931018.851945.731022.571032.56718.9913547.3
9251027.20950.87481.401007.831024.861957.881028.971038.65723.3513624.1
9301033.22956.44484.001013.741030.871970.051035.371044.76727.7013701.1
9351039.24962.02486.601019.651036.881982.231041.771050.86732.0613778.0
9401045.27967.60489.201025.571042.901994.441048.191056.97736.4213855.1
9451051.31973.17491.801031.491048.922006.661054.601063.08740.7813932.1
9501057.35978.76494.411037.411054.952018.901061.021069.20745.1514009.3
9551063.39984.34497.011043.341060.982031.161067.451075.32749.5214086.5
9601069.43989.93499.611049.271067.012043.431073.881081.44753.8814163.7
9651075.48995.52502.211055.201073.052055.721080.311087.57758.2514241.0
9701081.541001.11504.811061.141079.092068.031086.751093.70762.6314318.4
9751087.591006.70507.421067.081085.132080.361093.201099.84767.0014395.8
9801093.651012.30510.021073.031091.182092.701099.651105.97771.3814473.3
9851099.721017.90512.621078.981097.242105.061106.101112.12775.7614550.8
9901105.791023.50515.221084.931103.292117.441112.561118.26780.1414628.4
9951111.861029.10517.821090.891109.362129.841119.021124.41784.5214706.0
10001117.941034.70520.431096.851115.422142.251125.491130.56788.9014783.7
10051124.021040.31523.031102.811121.492154.681131.961136.72793.2914861.5
10101130.101045.92525.631108.771127.562167.131138.441142.88797.6814939.3
10151136.191051.53528.231114.741133.642179.591144.921149.04802.0715017.2
10201142.281057.15530.831120.721139.722192.081151.401155.21806.4615095.1
10251148.381062.77533.441126.691145.802204.581157.891161.38810.8515173.1
10301154.481068.38536.041132.671151.892217.091164.391167.55815.2515251.1
10351160.581074.00538.641138.661157.982229.631170.891173.73819.6515329.2
10401166.691079.63541.241144.641164.082242.181177.391179.91824.0415407.3
10451172.791085.25543.851150.631170.172254.751183.891186.10828.4515485.5
10501178.911090.88546.451156.621176.282267.331190.401192.28832.8515563.8
10551185.021096.51549.051162.621182.382279.931196.921198.47837.2515642.1
10601191.151102.14551.651168.621188.492292.551203.441204.67841.6615720.5
10651197.271107.78554.251174.621194.602305.191209.961210.86846.0715798.9
10701203.401113.41556.861180.631200.722317.841216.491217.06850.4815877.4
10751209.531119.05559.461186.641206.842330.511223.021223.27854.8915956.0
10801215.661124.69562.061192.651212.962343.201229.551229.47859.3016034.6
10851221.801130.33564.661198.661219.092355.911236.091235.68863.7116113.2
10901227.941135.97567.261204.681225.222368.631242.631241.89868.1316192.0
10951234.081141.62569.871210.701231.352381.371249.181248.11872.5516270.8
11001240.231147.27572.471216.731237.492394.121255.731254.33876.9716349.6
11051246.381152.92575.071222.751243.632406.891262.281260.55881.3916428.5
11101252.541158.57577.671228.781249.772419.681268.841266.78885.8116507.4
11151258.691164.22580.271234.821255.922432.491275.401273.00890.2416586.5
11201264.861169.88582.881240.851262.072445.311281.971279.23894.6616665.5
11251271.021175.54585.481246.891268.222458.151288.541285.47899.0916744.6
11301277.191181.20588.081252.941274.382471.011295.111291.70903.5216823.8
11351283.361186.86590.681258.981280.542483.881301.691297.94907.9516903.1
11401289.531192.52593.291265.031286.702496.771308.261304.19912.3816982.4
11451295.711198.19595.891271.081292.872509.671314.851310.43916.8217061.7
11501301.891203.85598.491277.141299.042522.601321.431316.68921.2517141.2
11551308.071209.52601.091283.191305.212535.541328.021322.93925.6917220.6
11601314.261215.19603.691289.251311.392548.491334.621329.19930.1317300.2
11651320.451220.86606.301295.321317.572561.461341.211335.45934.5717379.8
11701326.641226.54608.901301.381323.752574.451347.811341.71939.0117459.4
11751332.841232.21611.501307.451329.942587.461354.411347.97943.4517539.1
11801339.041237.89614.101313.521336.132600.481361.021354.23947.9017618.9
11851345.241243.57616.701319.591342.322613.521367.631360.50952.3417698.7
11901351.441249.25619.311325.671348.512626.581374.241366.77956.7917778.6
11951357.651254.94621.911331.751354.712639.651380.851373.05961.2417858.6
12001363.861260.62624.511337.831360.912652.741387.471379.32965.6917938.6
12051370.081266.31627.111343.921367.122665.841394.091385.60970.1418018.6
12101376.291272.00629.721350.011373.322678.961400.711391.89974.6018098.7
12151382.511277.69632.321356.101379.532692.101407.341398.17979.0518178.9
12201388.741283.38634.921362.191385.752705.251413.971404.46983.5118259.2
12251394.961289.07637.521368.281391.962718.421420.601410.75987.9618339.5
12301401.191294.77640.121374.381398.182731.611427.231417.04992.4218419.8
12351407.421300.46642.731380.481404.402744.811433.871423.34996.8818500.2
12401413.661306.16645.331386.591410.632758.031440.501429.631001.3518580.7
12451419.891311.86647.931392.691416.862771.271447.141435.941005.8118661.2
12501426.131317.56650.531398.801423.092784.521453.791442.241010.2718741.8
12601438.621328.97655.741411.031435.562811.081467.081454.851019.2118903.2
12701451.121340.39660.941423.261448.042837.701480.381467.481028.1419064.7
12801463.631351.81666.151435.511460.532864.381493.691480.111037.0919226.6
12901476.151363.23671.351447.761473.032891.131507.001492.751046.0419388.6
13001488.681374.67676.551460.031485.552917.941520.331505.411054.9919550.9
13101501.231386.11681.761472.301498.072944.821533.661518.071063.9519713.4
13201513.781397.55686.961484.591510.612971.761547.001530.741072.9219876.2
13301526.341409.01692.171496.881523.152998.771560.351543.431081.8920039.1
13401538.921420.46697.371509.191535.713025.841573.701556.121090.8620202.3
13501551.501431.93702.581521.501548.283052.981587.071568.821099.8420365.8
13601564.101443.40707.781533.821560.863080.181600.431581.531108.8220529.5
13701576.701454.87712.991546.161573.443107.441613.811594.251117.8120693.4
13801589.321466.35718.191558.501586.043134.771627.191606.981126.8120857.5
13901601.941477.84723.391570.851598.653162.161640.581619.721135.8121021.9
14001614.571489.33728.601583.211611.273189.611653.971632.461144.8121186.5
14201639.871512.34739.011607.951636.543244.711680.771657.981162.8321516.4
14401665.211535.36749.421632.731661.843300.071707.591683.531180.8721847.2
14601690.581558.41759.831657.551687.183355.671734.431709.121198.9322178.9
14801715.991581.48770.241682.401712.573411.541761.291734.741217.0122511.5
15001741.431604.57780.651707.281737.983467.651788.171760.391235.1022845.0
15201766.911627.68791.061732.191763.443524.021815.061786.071253.2223179.4
15401792.431650.81801.471757.141788.933580.641841.971811.781271.3523514.7
15601817.981673.96811.881782.121814.453637.521868.891837.531289.4923850.9
15801843.561697.13822.291807.131840.013694.651895.831863.301307.6624188.0
16001869.181720.32832.701832.171865.613752.031922.781889.111325.8424526.0
16201894.821743.54843.111857.241891.233809.661949.751914.941344.0324864.9
16401920.511766.77853.521882.351916.903867.551976.731940.801362.2425204.6
16601946.221790.02863.931907.481942.593925.702003.721966.691380.4725545.2
16801971.961813.29874.341932.641968.323984.102030.731992.611398.7225886.6
17001997.741836.58884.751957.831994.084042.752057.752018.561416.9826229.0
17202023.551859.89895.171983.052019.874101.672084.792044.541435.2626572.1
17402049.381883.21905.582008.302045.694160.842111.852070.541453.5526916.1
17602075.251906.56915.992033.582071.544220.262138.922096.571471.8627261.0
17802101.151929.92926.402058.882097.434279.952166.022122.621490.1827606.7
18002127.071953.31936.812084.212123.344339.902193.132148.701508.5227953.3
18202153.031976.71947.232109.572149.294400.112220.262174.811526.8828300.6
18402179.012000.13957.642134.962175.264460.582247.412200.941545.2528648.8
18602205.022023.57968.052160.372201.274521.322274.592227.101563.6328997.8
18802231.062047.03978.472185.822227.304582.332301.792253.281582.0329347.7
19002257.132070.50988.882211.282253.374643.602329.022279.491600.4529698.3
19202283.232094.00999.302236.782279.464705.142356.282305.731618.8830049.8
19402309.352117.511009.712262.302305.584766.952383.572331.991637.3330402.0
19602335.502141.041020.132287.852331.734829.042410.902358.271655.7930755.1
19802361.682164.591030.542313.422357.914891.402438.252384.581674.2631108.9
20002387.892188.161040.962339.022384.124954.032465.652410.911692.7531463.6
20202414.122211.751051.382364.652410.365016.952493.092437.271711.2631819.0
20402440.382235.351061.792390.312436.625080.152520.582463.651729.7832175.2
20602466.672258.981072.212415.982462.925143.632548.122490.061748.3132532.2
20802492.992282.621082.632441.692489.245207.392575.702516.491766.8632890.0
21002519.332306.281093.052467.422515.595271.442603.352542.941785.4333248.5
21202545.702329.961103.462493.182541.975335.792631.062569.421804.0133607.8
21402572.092353.661113.882518.962568.385400.422658.842595.921822.6033967.9
21602598.512377.381124.302544.772594.815465.362686.702622.451841.2134328.7
21802624.962401.111134.722570.612621.275530.592714.632649.001859.8434690.3
22002651.432424.871145.142596.472647.775596.122742.662675.571878.4835052.6

NOTES

Note 1. Of course, we all have computers to do these multi-range fifth-(or sometimes as much as ninth)-order equations. But in most heat exchange modelling processes, it is necessary not only to calculate enthalpy from temperature, but also to calculate temperature from enthalpy. Again, because the equations are mostly differentiable, the computer can do this, using Newton-Raphson iteration. But if speed is an issue, this is a slow process. It is much better to focus on a restricted range of interest, and to fit the data to a simpler (second-order at most) formula that can be solved by explicit algebra.