Select The Appropriate Units For this example, he has selected degrees F, psia, and lbm/ft3. For this example, he will find the density of propane gas at a temperature of 113☏ and a pressure of 20 psia. In this article, Jon Monsen has outlined the procedure for finding the actual density of a gas using the NIST Chemistry WebBook. To account for the difference between the Ideal Gas density and its actual density the ISA/IEC equation also requires the Compressibility Factor (symbol Z), which, unfortunately, is usually not easily found.
The most common of the ISA/IEC control valve gas sizing equations requires the pressure, temperature and molecular weight of the gas. It is often of interest to process engineers, and to engineers who need to do control valve sizing calculations, to know the actual density of a gas rather than simply calculating the density based on the Ideal Gas equation using the molecular weight, the pressure and the temperature of the gas.
#UTEXAS NIST CHEMISTRY WEBOOK FULL#
In order to make full use of the WebBook, one must spend a good deal of time exploring its content and capabilities. Of particular interest to those who deal with chemical processes is the NIST Chemistry WebBook which contains a great deal of information regarding the properties of a broad range of chemicals. Department of Commerce. NIST provides a wealth of scientific information, most of which is beyond the scope of this article.
The National Institute of Standards and Technology (NIST) is a part of the U.S.
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