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| one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences |
| the elasticlike force existing in the surface of a liquid caused by asymmetries in the intermolecular forces between surface molecules |
| group speed or group velocity | |
| —n | |
| physics the speed at which energy is propagated in a wave. This is the quantity determined when one measures the distance which the radiation travels in a given time. In a medium in which the speed increases with wavelength the group speed is less than the phase speed, and vice versa | |
| group velocity or group velocity | |
| —n | |