plural of surfactant

A person who illegally rides on the top of an elevator car, outside the actual confines of the car.

plural of control surface

interfacial energy

Someone carried by a crowd, in crowd surfing.

plural of surfboard

(differential geometry) A unit vector at any given point P of a surface M which is perpendicular to the tangent plane T_P(M) of M at P. For a surface with parametrization ⃑x(u,v), it is given by

(mathematics) A surface formed when a given curve is revolved around a given axis. If the resulting surface is a closed one, it also defines a solid of revolution.

(physics) An abstract boundary, of constant energy, useful for predicting the thermal, electrical, magnetic, and optical properties of metals, semimetals, and doped semiconductors.

(geometry) The total area on the surface of an object. / (computing) The total resources of a system that are accessible from the outside world and thus might be attacked.