Isochoric Properties for Helium
- Fluid Data
- Auxiliary Data
- Additional Information
- Important Information About This Data
- Other Data Available:
Isochoric Data for D = 136.00 kg/m3
Select a region with data to zoom. Select a region with no data or click the mouse on the plot to revert to the orginal display.
Moving the mouse pointer over or near a point will display the coordinates of the point. The number of digits shown do not reflect the uncertainty of the value.
On newer browsers the following keyboard commands are supported:
|L||Toggle log-log display if possible.|
|S||Toggle semilog (log Y) display if possible.|
|K||Move / hide legend (key). Repeated presses of this key will posiiton the legend in the following sequence: upper left, upper right, lower right, lower left, hidden.|
Click in or tab to the plot area to enable keyboard commands.
The following components were used in generating the plot:
- jQuery UI
- Plugins for Flot:
Additonal code used was developed at NIST: plot-data.js.
Use or mention of technologies or programs in this web site is not intended to imply recommendation or endorsement by the National Institute of Standards and Technology, nor is it intended to imply that these items are necessarily the best available for the purpose.
Reference States, ASHRAE Convention
|Enthalpy||H = 0 at -40°C for saturated liquid.|
|Entropy||S = 0 at -40°C for saturated liquid.|
Additional fluid properties
|Critical temperature (Tc)||-267.9547 C|
|Critical pressure (Pc)||32.990 psia|
|Critical density (Dc)||69.641 kg/m3|
|Normal boiling point||-268.920 C|
|Dipole moment||0.0 Debye|
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]
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]
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%.
The uncertainty in thermal conductivity is 5%, except at low temperatures where it increases to 10%.
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.
- Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
- The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
- Customer support for NIST Standard Reference Data products.