A cloud chamber holds water vapour at a saturation ratio at

PHYSICS · Subjective · Fermi University Physics · Thermal, Statistical & Complex Systems · Condensed Matter, Materials & Soft Matter · Interacting systems, real gases and phase equilibria

Soft Matter at the Thermal Scale, Ch Nucleation and the lifetime of a metastable phase

Problem

A cloud chamber holds water vapour at a saturation ratio S=p/p∞=3.5S = p/p_\infty = 3.5 at T=298 KT = 298\,\mathrm{K}, where p∞p_\infty is the saturated vapour pressure at that temperature. Using Δμ=kBTln⁡S\Delta\mu = k_BT\ln S, calculate the driving force per molecule for condensation, giving the answer both in units of kBTk_BT and in joules.

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