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1) Interface between the gas phase and the liquid phase is a sharp boundary.
2) Laminar film exist at the interface on both sides of the interface
3) Equilibrium exists at the interface, thus there is negligible resistance to mass transfer across
the interface: (xi, yi) is the equilibrium concentration.
4) No chemical reaction: rate of diffusion across the gas-phase film must equal the rate of diffusion
across the liquid-phase film
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