All Problems

Liquids. Capillary effects

Problem 2.182

A soap bubble of radius \(r\) is inflated with an ideal gas. The atmospheric pressure is \(p_{0},\) the surface tension of the soap water solution is \(\alpha .\) Find the difference between the molar heat capacity of the gas during its heating inside the bubble and the molar heat capacity of the gas under constant pressure, \(C-C_{p}\).

Reveal Answer
CCp=1/2R/(1+3/8p0r/α)C-C_{p}=1 / 2 R /\left(1+{ }^{3} /_{8} p_{0}^{\prime} r / \alpha\right)