Analytical Chemistry

Atomic and Molecular Physics

Biometrics

Biotechnology

Chemical and Crystal Structure

Chemical Kinetics

Chemistry

Communications

Construction

Environmental Data

Fire

Fluids

International Trade

Law Enforcement

Materials Properties

Mathematical Databases, Software and Tools

Optical Character Recognition

Physics

Product Design

Surface Data

Text and Video Retrieval

Thermophysical and Thermochemical

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.

Highlights

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. CYCLE_D has recently been updated.

The NIST Chemistry WebBook has thermophysical property data for 34 fluids, including density, enthalpy, internal energy, entropy, etc.

The codes in the list below have the following meanings:

REFLEAK, NIST LEAK/Recharge Simulation Program for Refrigerant Mixtures, PC, DG*
CYCLE_D: NIST Vapor Compression Cycle Design Program, PC, DG*
NIST Thermodynamic and Transport Properties of Pure Fluids, PC, DG*
NIST Reference Fluid Thermodynamic and Transport Properties Database, PC, DG*

NIST Thermophysical and Transport Properties of Hydrocarbon Mixtures, PC, DG*
NIST Mixture Property Database, PC, DG*
NIST/ASME Steam Database, PC, DG*
NIST Chemistry WebBook, Online, DG*
IUPAC-NIST Solubility Database Online, DG*