Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Problem:The equation that balances a pressure difference against this force times twice the mean curvature is given by Young and Laplace. Mass transport due to differentials in this force is named for Marangoni. Molecules with nonpolar and polar ends, which often may be used as (*) detergents or emulsifiers, act to decrease it; they are called surfactants. This force, which causes capillary action, arises in its namesake location because cohesive forces are exerted from only one direction, unlike in the bulk fluid. For 10 points, name this force present at the surface of a liquid.
Solution:
Social Science