Prob. 1: Laplace Law: thermodynamic properties of the interface between two phases are described by a state function called the surface tension σ. It is defined in terms of the work required to increase the surface area by an amount dA through dW = odA. By considering the work done against surface tension in an infinitesimal change in radius, show that the pressure inside a spherical drop of water of radius R is larger than outside pressure by 20/R. What is the air pressure inside a soap bubble of radius R?

Prob. 1: Laplace Law: thermodynamic properties of the interface between two phases are described by a state function called the surface tension σ. It is defined in terms of the work required to increase the surface area by an amount dA through dW = odA. By considering the work done against surface tension in an infinitesimal change in radius, show that the pressure inside a spherical drop of water of radius R is larger than outside pressure by 20/R. What is the air pressure inside a soap bubble of radius R?

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter11: Molecular Structure

Section: Chapter Questions

Problem 12P

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