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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 and named after Samuel Pierpont Langley (1834–1906) in 1947.
One langley is
- 1 thermochemical calorie per square centimetre, i. e.
- 41840 J/m2 (joules per square metre),
- ca. 11.622 watt-hours per square metre.
- 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.