All Problems

Liquids. Capillary effects

Problem 2.180

Find the increment of the free energy of the surface layer when two identical mercury droplets, each of diameter d=1.5 mmd=1.5 \mathrm{~mm} merge isothermally.

Reveal Answer
ΔF=2παd2(2−1/3−1)=−1.5μJ\Delta F=2 \pi \alpha d^{2}\left(2^{-1 / 3}-1\right)=-1.5 \mu \mathrm{J}
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