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PDF] Compressibility Chart for Hydrogen and Inert Gases

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industrial processes using high pressure hydrogen, WITH helium,neon,and argon becoming common, there is a great need for an accurate compressibility chart of these gases. The generalized compressibility chart commonly used ( 2 ) is highly inaccurate for the above gases. Newton (9) found that an empirical correction quantity of 8 added to both the critical temperature, T,, and critical pressure, P,, of hydrogen, helium, and neon allowed the use of his generalized activity coefficient chart with a fair degree of accuracy. Dodge ( 2 ) suggested using the same quantities for the generalized compressibility chart. However, lately it has been shown that these quantities are only accurate over very limited ranges of temperature and pressure (8). In other