Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Fugacity is a chemical quantity with units of pressure that is intended to better describe a gas's real-world pressure than the ideal pressure "P" used in the ideal gas law. Fugacities are determined experimentally or estimated for various models such as a "Van der Waals gas" that are closer to reality than an "ideal gas". The ideal gas pressure and fugacity are related through the dimensionless fugacity coefficient .

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