energy density The energy contained per unit volume of space. General relativity provides a way of calculating the energy density associated with a given curvature of spacetime. Some schemes for faster-than-light travel call for regions of negative energy density – a strange condition, but one that exists in phenomena such as the Casimir effect. Related category • SPACE AND TIME Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |