Emanation (physics)
Emanation is a generic term for the release of material in non-solid or liquid form from mostly solid starting compounds. The term is used in mineralogy, geology, physics and chemistry. An example of emanation is the escape of gaseous products during radioactive decay . In Isaac Newton's theory of light ( corpuscle theory ), emanation is the emanation of light matter from luminous bodies.
The first widespread use of the term emanation occurred in the years from 1900. The isotope 222 Rn was designated as emanation ( per se , without additional information), which is created when radium decays and makes up the main part of the radiation emitted by radium. Since this changes due to air movement, solution or heating, the creation of a new gas was soon blamed for it. Only later, when other such gases became known, they were distinguished by additionally naming the source ( radium emanation ).
Individual evidence
- ↑ E. Dorn: About the emanation sent out by radioactive substances. In: Dep. Naturf. Ges. Halle. 23, 1900, pp. 1-15. urn : nbn: de: hebis: 30-1090447
- ↑ M. Curie: Investigations on the radioactive substances. Braunschweig 1904. (Reprint: Vieweg & Teubner, 2004, ISBN 3-663-12784-2 )