the pressure exerted on a surface by electromagnetic radiation or by sound waves.
Force per unit area exerted by waves or particles of radiation, especially photons. Though photons have no mass, they do have momentum, and can transfer that momentum to other particles upon impact. The amount of pressure exerted by a given amount of radiation depends on whether the radiation is absorbed or reflected. Radiation pressure is responsible for the Casimir effect; solar radiation pressure is exploited in the design of solar sails.
- Radiation pyrometer
noun 1. See pyrometer
- Radiation resistance
noun 1. the resistive component of the impedance of a radio transmitting aerial that arises from the radiation of power
noun, Pathology. 1. sickness caused by irradiation with x-rays or other nuclear radiation as a result of therapeutic treatment, accidental exposure, or a nuclear bomb explosion and characterized by nausea, vomiting, headache, cramps, diarrhea, loss of hair and teeth, destruction of white blood cells, and prolonged hemorrhage. noun 1. (pathol) illness caused by overexposure of […]
noun 1. . [rey-dee-oh-ther-uh-pee] /ˌreɪ di oʊˈθɛr ə pi/ noun, Medicine/Medical. 1. treatment of disease by means of x-rays or of radioactive substances. /ˌreɪdɪəʊˈθɛrəpɪ/ noun 1. the treatment of disease, esp cancer, by means of alpha or beta particles emitted from an implanted or ingested radioisotope, or by means of a beam of high-energy radiation […]