Given the task definition and input, reply with output. 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.

A statistical-mechanical expression for this property has been developed by Boudh-Hir and Mansoori that is based on the Macleod formula. The dimensionless Weber number is equal to density times velocity-squared times diameter, divided by this value. The Marangoni effect is caused by variations in this property, and the YoungLaplace equation relates the difference in pressure with it. Jaeger's method for calculating its value involves producing a small bubble, and the recently developed drop collapse method uses a smaller volume of sample than the du Nouy ring method. Often measured in Joules per meters squared, it is caused by unbalanced intermolecular forces, and its value is decreased by rising temperatures, in addition to the presence of soaps, detergents, and other surfactants. For 10 points, name this tendency of liquids to reduce their exposed surface, a phenomenon that enables some insects to walk on water.
Science