Thermodynamics of Fluids
Activity is a measure of the effective concentration of a species in a mixture, which reflects its behavior compared to an ideal solution. It plays a crucial role in understanding how substances interact in real solutions, taking into account non-idealities like intermolecular forces. This concept is tied closely to activity coefficients, which quantify how much a species deviates from ideal behavior, and is foundational in laws that govern vapor-liquid equilibria.
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