Foe (unit)

Physical unit
Unit name	Foe
Unit symbol	${\displaystyle \mathrm {foe} }$
Physical quantity (s)	Energy (e.g. work , internal energy , heat )
Formula symbol	${\displaystyle W;\,A;\,E;\,U;\,Q}$
dimension	${\displaystyle {\mathsf {M\,L^{2}\,T^{-2}}}}$
In SI units	${\displaystyle {\begin{aligned}\mathrm {1\,foe} &=\mathrm {1\cdot 10^{44}\,J} \\&=\mathrm {1\cdot 10^{44}{\frac {kg\,m^{2}}{s^{2}}}} \end{aligned}}}$
In CGS units	${\displaystyle \mathrm {1\,foe=1\cdot 10^{51}\,erg} }$

The Foe is a unit of energy that corresponds to the value of 10 ⁴⁴ joules or 10 ⁵¹ ergs and is in the order of magnitude of the amount of energy that is released in a supernova . The word is an acronym derived from the English of (10 ⁵¹ erg) "ten to the power of f ifty- o ne e rgs". is formed.

It was coined by Gerald E. Brown of Stony Brook University in his work with Hans Bethe because it came up often enough in their work. To honor Bethe, who died in 2005, Steven Weinberg coined the name Bethe ( B ), which is equivalent to Foe .

This unit of measurement is useful because a supernova typically releases about one foe of observable energy in a very short period of time (on the order of seconds). If the sun had its current luminosity during its entire lifespan, it would release 3.827 · 10 ²⁶ W × 3.1536 · 10 ⁷ s / year × 10 ¹⁰ years ≈ 1.2 foe of energy in comparison . A solar mass has a rest energy of 1787 foe.

See also

• Magnitude (energy)

Individual evidence

1. ^ Hartmann DH: Afterglows from the largest explosions in the universe . In: Proc. Natl. Acad. Sci. USA . 96, No. 9, April 1999, pp. 4752-5. bibcode : 1999PNAS ... 96.4752H . doi : 10.1073 / pnas.96.9.4752 . PMID 10220364 . PMC 33568 (free full text).
2. ↑ Neutrinos and Supernovae (PDF) In: Los Alamos Sciences . Los Alamos National Laboratory . October 25, 1997. Retrieved March 18, 2019.
3. ↑ Gerald Brown: Hans Bethe and His Physics . World Scientific , 2006, ISBN 981-256-609-0 .
4. ↑ Physics World, A Bethe unit Stephen Weinberg doi: 10.1088 / 2058-7058 / 19/2/31 .