Task: Text Categorization
Input (English): The Young-Dupr equation relates this property to the contact angle. The ratio of buoyant forces to forces generated by this property is the dynamic Bond number. The Marangoni number is directly proportional to the variation in this property during Marangoni convection, which is induced by this property. For certain objects, it is equal to the change in (*) pressure times the radius of the object divided by two via Laplace's Law. Defined as the free energy per unit of surface area, for 10 points, name this tendency for like molecules at an interface to cohere, a property that can be reduced with the use of surfactants.
Output (English): Science