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# Ammonia - Specific heat (heat capacity) at varying temperature and pressure

## Online calculator, figures and tables showing specific heat (heat capacity), CP and CV, of gasous and liquid ammonia at temperatures ranging from -73 to 425°C (-100 to 800°F) at pressure ranging from 1 to 100 bara (14.5 - 1450 psia) - SI and Imperial Units

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

• Isobaric heat capacity  (Cp) is used for ammonia in a constant pressure (ΔP = 0) system.
• Isochoric heat capacity  (Cv) is used for ammonia in a constant-volume, (= isovolumetric or isometric) closed system.

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

However,  the specific heat  - CP and CV - 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 (= heat capacity) should be corrected according values in the figures and table below, or found by use of the calculator.

### Online Gaseous Ammonia Heat Capacity Calculator

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

Temperature

Choose the actual unit of temperature: °C  °F  °R
Choose the actual pressure:  1 bara / 14.5 psia; 10 bara / 145 psia; 50 bara / 725 psia; 100 bara / 1450 psia;

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

Isobaric heat capacity, CP, of ammonia at given temperatures and pressures:

For full table with Heat Capacity at Constant Pressure - rotate the screen!

 State Temperature Pressure Heat capacity at constant pressure, CP (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 heat capacity, CV, of ammonia at given temperatures and pressures:

For full table with Heat Capacity at Constant Volume - rotate the screen!

 State Temperature Pressure Heat capacity at constant volume,  CV  (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 oC) = 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

## Related Topics

• Fluid Mechanics - The study of fluids - liquids and gases. Involves velocity, pressure, density and temperature as functions of space and time
• Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more
• Thermodynamics - Effects of work, heat and energy on systems
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## Citation

• Engineering ToolBox, (2018). Ammonia - Specific heat (heat capacity) at varying temperature and pressure. [online] Available at: https://www.engineeringtoolbox.com/ammonia-heat-capacity-specific-temperature-pressure-Cp-Cv-d_2016.html [Accessed Day Mo. Year].

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