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Industrial Fluids and Chemical Engineering

Providing reliable data on the thermophysical properties of fluid mixtures has been a primary area of focus of NIST. A set of combined theoretical and empirical predictive techniques have been developed that rest firmly on evaluated data.

These techniques have been tested and incorporated into interactive computer programs that generate a large variety of properties based upon the specified composition and the appropriate state variables.


Databases are now available for hydrocarbon mixtures, including natural gas, as well as a number of pure and mixed fluids of industrial importance. NIST (REFPROP) continues to be a timely and valuable tool for refrigeration engineers and chemical and equipment manufacturers. The new version 9.0 was released in 2010.

The NIST Chemistry WebBook has thermophysical property data for 74 fluids, including density, enthalpy, internal energy, entropy, etc.

The codes in the list below have the following meanings:

PC PC product, most available for purchase, some are free
Online Free online system
DG Inclusion in the NIST Data Gateway - a portal providing access to many NIST scientific and technical databases. It is searchable by keyword, property, or substance name.
* Product contains data that have undergone rigorous critical evaluation by experienced researchers who recommend best values.
Online Subscription Product is a yearly subscription web product.

SRD 73 REFLEAK, NIST LEAK/Recharge Simulation Program for Refrigerant Mixtures, PC, DG, *
SRD 49 CYCLE_D: NIST Vapor Compression Cycle Design Program, PC, DG, *
SRD 23 NIST Reference Fluid Thermodynamic and Transport Properties Database (REFPROP), PC, DG, *
SRD 4 NIST Thermophysical and Transport Properties of Hydrocarbon Mixtures, PC, DG, *
SRD 10 NIST/ASME Steam Properties Database, PC, DG, *
SRD 69 NIST Chemistry WebBook, Online, DG, *
SRD 106 IUPAC-NIST Solubility Database Online, DG, *
SRD 147 NIST Ionic Liquids Database - (IL Thermo) Online, DG, *