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Ammonia - Specific Heat vs. Temperature and Pressure

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Specific heat (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.

  • Isobaric specific heat (C p ) is used for ammonia in a constant pressure (ΔP = 0) system.
  • I sochoric specific heat (C v ) is used for ammonia in a constant-volume , (= isovolumetric or isometric ) closed system.

At ambient pressure and temperature the isobaric specific heat, C P , of ammonia is 2.2 [kJ/kg K] or 0.52 [Btu/lb °F] = [cal/g K], while the isochoric specific heat, C V , is 1.6 [kJ/kg K] or 0.39 [Btu/lb °F] = [cal/g K].

However,  the specific heat  - C P and C V - will vary with temperature. This may influence on the accuracy of ammonia conditioning and industrial ammonia handling process calculations. When calculating mass and volume flow of ammonia in heated or cooled systems with high accuracy - the specific heat should be corrected according values in the figures and table below, or found by use of the calculator.

Online Gaseous Ammonia Specific Heat Calculator

The calculator below can be used to estimate the specific heat of gaseous ammonia at constant volum or constant pressure and at given temperature and pressure.
The output specific heat is given as kJ/(kmol*K), kJ/(kg*K), kWh/(kg*K), kcal/(kg*K), Btu(IT)/(mol*°R) and Btu(IT)/(lb m *°R)

Choose the actual unit of temperature:
Choose the actual pressure:



See also other properties of Ammonia at varying temperature and pressure: Density and specific weight , Dynamic and kinematic viscosity , Prandtl Number , Properties at Gas-Liquid Equilibrium pressure , Specific Heat (Heat Capacity) and Thermal Conductivity , and Thermophysical properties at standard conditions and Vapour pressure at gas-liquid equilibrium ,
as well as Specific heat of Air - at Constant Pressure and Varying Temperature , Air - at Constant Temperature and Varying Pressure , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Hydrogen , Methane , Methanol , Nitrogen , Oxygen , Propane and Water .














Isobaric specific heat, C P , of ammonia at given temperatures and pressure s:

For full table with specific heat at Constant Pressure - rotate the screen!

Ammonia - Specific Heat vs. Temperature and Pressure
State Temperature Pressure Specific Heat at constant pressure, C P (isobaric) Cp/Cv
[K] [°C] [°F] [MPa] [bara] [psia] [kJ/mol K] [kJ/kg K] [kWh/(kg K)] [kcal(IT)/(kg K)],
[Btu(IT)/lb °F] 		[Btu(IT)/(mol °F)] [-]
Liquid -73.2 -99.7 0.1 1 15 0.071983 4.2266 0.001174 1.009 0.03790 1.44
239.56 -33.6 -28.5 0.1 1 15 0.075726 4.4464 0.001235 1.062 0.03987 1.56
Gas 239.56 -33.6 -28.5 0.1 1 15 0.039079 2.2946 0.0006374 0.5480 0.02058 1.35
300 26.9 80.3 0.1 1 15 0.036849 2.1636 0.0006010 0.5168 0.01940 1.32
400 127 260 0.1 1 15 0.038883 2.2831 0.0006342 0.5453 0.02047 1.28
500 227 440 0.1 1 15 0.04228 2.4825 0.0006896 0.5929 0.02226 1.25
600 327 620 0.1 1 15 0.046083 2.7058 0.0007516 0.6463 0.02426 1.22
700 427 800 0.1 1 15 0.050015 2.9367 0.0008158 0.7014 0.02633 1.20
Liquid 200 -73.2 -99.7 1 10 145 0.071938 4.2239 0.001173 1.009 0.03788 1.44
298.05 24.9 76.8 1 10 145 0.081465 4.7833 0.001329 1.142 0.04289 1.73
Gas 298.05 24.9 76.8 1 10 145 0.053356 3.1329 0.0008703 0.7483 0.02809 1.47
300 26.9 80.3 1 10 145 0.052493 3.0822 0.0008562 0.7362 0.02764 1.46
400 127 260 1 10 145 0.041627 2.4442 0.0006789 0.5838 0.02192 1.32
500 227 440 1 10 145 0.04334 2.545 0.0007069 0.6078 0.02282 1.26
600 327 620 1 10 145 0.04663 2.738 0.0007605 0.6539 0.02455 1.23
700 427 800 1 10 145 0.05034 2.956 0.0008211 0.7060 0.02651 1.20
Liquid 200 -73.2 -99.7 5 50 725 0.07174 4.212 0.001170 1.006 0.03777 1.43
300 26.9 80.3 5 50 725 0.08090 4.750 0.001319 1.135 0.04260 1.72
362.03 88.9 192 5 50 725 0.10538 6.188 0.001719 1.478 0.05549 2.23
Gas 362.03 88.9 192 5 50 725 0.10501 6.166 0.001713 1.473 0.05529 2.16
400 127 260 5 50 725 0.06158 3.616 0.001004 0.8636 0.03242 1.60
500 227 440 5 50 725 0.04878 2.864 0.0007956 0.6841 0.02568 1.35
600 327 620 5 50 725 0.04921 2.889 0.0008026 0.6901 0.02591 1.27
700 427 800 5 50 725 0.05184 3.044 0.0008455 0.7270 0.02729 1.23
Liquid 200 -73.2 -99.7 10 100 1450 0.07150 4.198 0.001166 1.003 0.03764 1.42
300 26.9 80.3 10 100 1450 0.07996 4.695 0.001304 1.121 0.04210 1.70
398.32 125 257 10 100 1450 0.30653 18.00 0.005000 4.299 0.16140 5.77
Gas 398.32 125 257 10 100 1450 0.46915 27.55 0.007652 6.579 0.24702 7.76
400 127 260 10 100 1450 0.30552 17.94 0.004983 4.285 0.16086 5.30
500 227 440 10 100 1450 0.05806 3.409 0.0009470 0.8142 0.03057 1.50
600 327 620 10 100 1450 0.05281 3.101 0.0008613 0.7406 0.02780 1.32
700 427 800 10 100 1450 0.05380 3.159 0.0008774 0.7544 0.02833 1.25
Liquid 300 26.9 80.3 100 1000 14500 0.07274 4.271 0.001186 1.020 0.03830 1.49
400 127 260 100 1000 14500 0.07557 4.437 0.001233 1.060 0.03979 1.62
500 227 440 100 1000 14500 0.07550 4.433 0.001231 1.059 0.03975 1.64
600 327 620 100 1000 14500 0.07519 4.415 0.001226 1.055 0.03959 1.61
700 427 800 100 1000 14500 0.07519 4.415 0.001226 1.055 0.03959 1.56

Isochoric specific heat, C V , of ammonia at given temperatures and pressure s:

For full table with specific heat at Constant Volume - rotate the screen!

Ammonia - Specific Heat vs. Temperature and Pressure
State Temperature Pressure Specific Heat at constant volume,  C V (isochoric) Cp/Cv
[K] [°C] [°F] [MPa] [bara] [psia] [kJ/mol K] [kJ/kg K] [kWh/(kg K)] [kcal(IT)/(kg K)],
[Btu(IT)/lb °F] 		[Btu(IT)/(mol °F)] [-]
Liquid -73.2 -99.7 0.1 1 15 0.04984 2.927 0.0008129 0.6990 0.02624 1.44
239.56 -33.6 -28.5 0.1 1 15 0.04863 2.855 0.0007931 0.6819 0.02560 1.56
Gas 239.56 -33.6 -28.5 0.1 1 15 0.02901 1.703 0.0004731 0.4068 0.01527 1.35
300 26.9 80.3 0.1 1 15 0.02802 1.645 0.0004570 0.3930 0.01475 1.32
400 127 260 0.1 1 15 0.03042 1.786 0.0004961 0.4266 0.01602 1.28
500 227 440 0.1 1 15 0.03390 1.990 0.0005529 0.4754 0.01785 1.25
600 327 620 0.1 1 15 0.03773 2.215 0.0006154 0.5291 0.01987 1.22
700 427 800 0.1 1 15 0.04168 2.447 0.0006798 0.5845 0.02194 1.20
Liquid 200 -73.2 -99.7 1 10 145 0.04989 2.929 0.0008137 0.6997 0.02627 1.44
298.05 24.9 76.8 1 10 145 0.04709 2.765 0.0007680 0.6603 0.02479 1.73
Gas 298.05 24.9 76.8 1 10 145 0.03627 2.130 0.0005916 0.5087 0.01910 1.47
300 26.9 80.3 1 10 145 0.03587 2.106 0.0005850 0.5030 0.01888 1.46
400 127 260 1 10 145 0.03164 1.858 0.0005161 0.4437 0.01666 1.32
500 227 440 1 10 145 0.03431 2.015 0.0005596 0.4812 0.01807 1.26
600 327 620 1 10 145 0.03793 2.227 0.0006186 0.5319 0.01997 1.23
700 427 800 1 10 145 0.04179 2.454 0.0006816 0.5861 0.02200 1.20
Liquid 200 -73.2 -99.7 5 50 725 0.05010 2.942 0.0008171 0.7026 0.02638 1.43
300 26.9 80.3 5 50 725 0.04709 2.765 0.0007681 0.6604 0.02479 1.72
362.03 88.9 192 5 50 725 0.04715 2.769 0.0007691 0.6613 0.02483 2.23
Gas 362.03 88.9 192 5 50 725 0.04872 2.861 0.0007947 0.6833 0.02565 2.16
400 127 260 5 50 725 0.03847 2.259 0.0006274 0.5395 0.02025 1.60
500 227 440 5 50 725 0.03619 2.125 0.0005903 0.5076 0.01906 1.35
600 327 620 5 50 725 0.03880 2.278 0.0006328 0.5441 0.02043 1.27
700 427 800 5 50 725 0.04229 2.483 0.0006897 0.5931 0.02227 1.23
Liquid 200 -73.2 -99.7 10 100 1450 0.05034 2.956 0.0008211 0.7060 0.02651 1.42
300 26.9 80.3 10 100 1450 0.04716 2.769 0.0007693 0.6614 0.02483 1.70
398.32 125 257 10 100 1450 0.05315 3.121 0.0008669 0.7454 0.02798 5.77
Gas 398.32 125 257 10 100 1450 0.06045 3.549 0.0009859 0.8477 0.03183 7.76
400 127 260 10 100 1450 0.05761 3.383 0.0009397 0.8079 0.03033 5.30
500 227 440 10 100 1450 0.03860 2.267 0.0006296 0.5414 0.02033 1.50
600 327 620 10 100 1450 0.03986 2.341 0.0006502 0.5590 0.02099 1.32
700 427 800 10 100 1450 0.04290 2.519 0.0006996 0.6016 0.02259 1.25
Liquid 300 26.9 80.3 100 1000 14500 0.04889 2.871 0.0007975 0.6857 0.02574 1.49
400 127 260 100 1000 14500 0.04664 2.738 0.0007606 0.6540 0.02456 1.62
500 227 440 100 1000 14500 0.04600 2.701 0.0007503 0.6451 0.02422 1.64
600 327 620 100 1000 14500 0.04672 2.743 0.0007621 0.6552 0.02460 1.61
700 427 800 100 1000 14500 0.04833 2.838 0.0007883 0.6778 0.02545 1.56

Unit conversion:

Specific heat unit converter

british thermal unit(International table) = [Btu(IT)], degree celcius = [°C], degree fahrenheit = [°F], degree kelvin = [K], degree rankin = [°R], joule = [J], kilocalorie(International table) = [kcal(IT)], kilogram = [kg], kilojoule = [kJ], kilowatthour = [kWh], mole = [mol], pound =[lb]

K in the units can be replaced by °C, and vise versa. °R in the units can be replaced by °F, and vise versa.

  • 1 Btu/(lb °F) = 1 Btu/(lb °R) = 1 kcal(IT)/(kg °C) = 1 kcal(IT)/(kg K) = 4186.8 J/(kg K) = 0.81647 kcal(IT)/(lb °F) = 1.163x10 -3 kWh/(kg K)
  • 1 J/(kg K) = 1 J/(kg °C) = 2.3885x10 -4 kcal(IT)/(kg o C) = 2.3885x10 -4 Btu/(lb °F) = 1.9501x10 -4 kcal(IT)/(lb °F)
  • 1 kcal(IT)/(kg °C) = 1 Btu/(lb °F) = 4186.8 J/(kg K) = 0.81647 kcal(IT)/(lb °F) = 1.163x10 -3 kWh/(kg K)
  • 1 kcal(IT)/(lb °F) = 1.2248 Btu/(lb °F) = 1.2248 kcal(IT)/(kg °C) = 5127.9 J/(kg K)
  • 1 kJ/(kg K) = 1 kJ/(kg °C) = 1000 J/(kg K) = 1000 J/(kg °C) = 0.23885 kcal(IT)/(kg °C) = 0.23885 Btu/(lb °F) = 0.19501 kcal(IT)/(lb °F) = 2.7778x10 -4 kWh/(kg K)
  • 1 kWh/(kg K) = 0.85985 kcal(IT)/(kg °C) = 0.85985 Btu/(lb °F) = 3.6 kJ/(kg K)
  • 1 mol of air = 28.96546 g
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