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The effect of gravitational field on thermodynamics of ideal-dilute solutions

Aryan Taghvaei

It's customary in physical chemistry textbooks to neglect the effect of gravity on thermodynamic properties. But is it always an accurate procedure? in this paper we have tried to obtain gravitational corrections to internal energy, entropy, enthalpy, Gibbs free energy and molecular distribution for nonelectrolyte ideal-dilute solutions. We have shown these corrections to be approximately 𝐸𝑐𝑜𝑟 ≈ 𝑔 2𝐷 2 12𝑅𝑇 ∑ 𝑛𝑖𝑀𝑖 2 𝑖 , 𝑆𝑐𝑜𝑟 ≈ 𝑔 2𝐷 2 24𝑅𝑇2 ∑ 𝑛𝑖𝑀𝑖 2 𝑖 (and similar equations for G and H). Finally, some rules are suggested for deciding whether it is necessary to consider the effect of gravity. Keywords: gravitational field, ideal-dilute solutions, equilibrium thermodynamics, chemical