%0 Journal Article
%T Revised Standardized Equation for Hydrogen Gas Densities for Fuel Consumption Applications
%A Lemmon
%A Eric W.
%A Huber
%A Marcia L.
%A Leachman
%A Jacob W.
%J Journal of Research of the National Institute of Standards and Technology
%D 2008
%I The National Institute of Standards and Technology
%X An equation for the density of hydrogen gas has been developed that agrees with the current standard to within 0.01% from 220 K to 1000 K with pressures up to 70 MPa, to within 0.01% from 255 K to 1000 K with pressures to 120 MPa, and to within 0.1% from 200 K to 1000 K up to 200 MPa. The equation is a truncated virial-type equation based on pressure and temperature dependent terms. The density uncertainty for this equation is the same as the current standard and is estimated to be 0.04% (combined uncertainty with a coverage factor of 2) between 250 K and 450 K for all pressures, and 0.1% for lower temperatures. Comparisons are presented with experimental data and with the full equation of state.
%K density
%K equation of state
%K fuel consumption
%K hydrogen
%K pressure
%K temperature
%U http://nvl.nist.gov/pub/nistpubs/jres/113/6/V113.N06.A05.pdf