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[edit]
One langley is
- 1 thermochemical calorie per square centimetre,[2]
- 41 840 J/m2 (joules per square metre)[3]
See also[edit]
References[edit]
- ^ 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. Retrieved 2013-04-14.
- ^ "Solar Energy at Race Rocks". Archived from the original on 2013-10-05. Retrieved 2010-08-05.
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