Langley (unit)

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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

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One langley is

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

## See also

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* Solar constant
* Radiant exposure

## References

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1. ^ Gyllenbok, Jan (2018). "langley". Encyclopaedia of Historical Metrology, Weights, and Measures, Volume 1. Birkhäuser. p. 139\. ISBN 9783319575988.
2. ^ "Appendix B9. Conversion Factors". NIST Guide to the SI. The National Institute of Standards and Technology. 2010-10-05. Retrieved 2013-04-14.
3. ^ "Solar Energy at Race Rocks". Archived from the original on 2013-10-05. Retrieved 2010-08-05.

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