![]() ![]() 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. #Nist webook propane fullIn 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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