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Isobaric Properties for Helium

Fluid Data

Isobaric Data for P = 1.2000 atm

Temperature (K)Pressure (atm)Density (kg/m3)Volume (m3/kg)Internal Energy (kJ/kg)Enthalpy (kJ/kg)Entropy (J/g*K)Cv (J/g*K)Cp (J/g*K)Sound Spd. (m/s)Joule-Thomson (F/atm)Viscosity (uPa*s)Therm. Cond. (W/m*K)Phase
14.0001.20004.22450.2367147.88276.66511.6373.12045.3354220.720.349882.84730.021038vapor
14.5001.20004.07290.2455249.47679.33011.8243.12085.3257224.730.330972.91380.021504vapor
15.0001.20003.93210.2543151.06881.99012.0053.12105.3169228.670.313292.97940.021963vapor
15.5001.20003.80100.2630952.65884.64712.1793.12135.3090232.530.296743.04400.022414vapor
16.0001.20003.67860.2718554.24687.29912.3483.12145.3018236.320.281213.10780.022860vapor
16.5001.20003.56390.2805955.83289.94912.5113.12165.2952240.040.266603.17070.023299vapor
17.0001.20003.45640.2893257.41692.59512.6693.12175.2893243.700.252833.23280.023733vapor
17.5001.20003.35520.2980458.99995.23812.8223.12175.2838247.300.239853.29420.024162vapor
18.0001.20003.26000.3067560.58197.87912.9713.12185.2788250.840.227573.35480.024586vapor
18.5001.20003.17010.3154562.162100.5213.1153.12185.2741254.330.215953.41460.025005vapor
19.0001.20003.08510.3241463.741103.1513.2563.12185.2699257.770.204943.47380.025420vapor
19.5001.20003.00460.3328265.319105.7913.3933.12185.2659261.160.194493.53230.025831vapor
20.0001.20002.92830.3414966.897108.4213.5263.12185.2622264.500.184553.59020.026237vapor

Auxiliary Data

Reference States, Normal Boiling Point Convention

Additional fluid properties

References

Equation of state, auxiliary model, and melting curve

McCarty, R.D.; Arp, V.D., A New Wide Range Equation of State for Helium., Adv. Cryo. Eng., 1990, 35, 1465-1475. [all data]

Thermal conductivity

Hands, B.A.; Arp, V.D., A Correlation of Thermal Conductivity Data for Helium, Cryogenics, 1981, 21, 12, 697-703. [all data]

Viscosity and surface tension

Arp, V.D.; McCarty, R.D.; Friend, D.G., Thermophysical Properties of Helium-4 from 0.8 to 1500 K with Pressures to 2000 MPa, Technical Note 1334, National Institute of Standards and Technology, Boulder, CO, 1998, 0. [all data]

Additional Information

Equation of state

The uncertainties of the equation of state range from 1% at low temperatures (<20 K) to 0.1% at temperatures between 200 and 400 K, and from 3% in the speed of sound in the liquid phase to 0.1% in the speed of sound between 100 and 500 K. The uncertainty of heat capacities is about 5%.

Thermal conductivity

The uncertainty in thermal conductivity is 5%, except at low temperatures where it increases to 10%.

Viscosity

The uncertainty in viscosity is 10%.

Important Information About This Data

The data above are from an older version of the NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP version 7). We will be updating our site to use the newer version (version 10) of this database in the future. Information on REFPROP version 10 can be found on theREFPROP web page. REFPROP version 10 includes additional data and features not available from this site.

Notes