|WTT User's Guide|
ln(p/p°) = a1 + a2/T + a3×ln(T) + a4×T + a5×T2 + a6/T2 + a7×T6 + a8/T4
where p° = 1 kPa
The basis for this functional form is discussed in .
©2012 copyright by the US Secretary of Commerce on
behalf of the United States of America. All rights reserved.
The TRC Group is part of the Thermophysical Properties Division in NIST's Material Measurement Laboratory
The National Institute of Standards and Technology is an agency of the U.S. Department of Commerce