Langley (unit)

langley
Unit system	Non-SI metric unit
Unit of	Heat flux
Symbol	Ly
Named after	Samuel Langley
Derivation	1 calth/cm2
Conversions
1 Ly in ...	... is equal to ...
SI units	41 840 J/m2

The langley (Ly) is a unit of heat transmission, especially used to express the rate of solar radiation (or insolation) received by the earth. The unit was proposed by Franz Linke in 1942^[1] and named after Samuel Langley (1834–1906) in 1947.

Definition

One langley is

1 thermochemical calorie per square centimetre,^[2]
41 840 J/m² (joules per square metre)^[3]

References

↑ Gyllenbok, Jan (2018). "langley". Encyclopaedia of Historical Metrology, Weights, and Measures, Volume 1. Birkhäuser. p. 139. ISBN 9783319575988.
↑ "Appendix B9. Conversion Factors.". NIST Guide to the SI. The National Institute of Standards and Technology. 2010-10-05. http://physics.nist.gov/Pubs/SP811/appenB9.html. Retrieved 2013-04-14.
↑ "Solar Energy at Race Rocks". http://www.racerocks.com/racerock/abiotic/solar/solar.htm.

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Original source: https://en.wikipedia.org/wiki/Langley (unit). Read more

[1] Gyllenbok, Jan (2018). "langley". Encyclopaedia of Historical Metrology, Weights, and Measures, Volume 1. Birkhäuser. p. 139. ISBN 9783319575988.

[nistguide-2] "Appendix B9. Conversion Factors.". NIST Guide to the SI. The National Institute of Standards and Technology. 2010-10-05. http://physics.nist.gov/Pubs/SP811/appenB9.html. Retrieved 2013-04-14.

[3] "Solar Energy at Race Rocks". http://www.racerocks.com/racerock/abiotic/solar/solar.htm.

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Langley (unit)

Definition

See also

References