Worlds of David Darling
Encyclopedia of Science
Home > Encyclopedia of Science


A measure of the energy or number of particles passing through a given area of surface in unit time. Luminous flux is the rate of flow of electromagnetic radiation and is measured in lumens. Particle flux is the number of particles, for example in the solar wind, passing through a unit area per second. Magnetic flux is a measure of the strength of a magnetic field perpendicular to a surface.

Related category