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.
| 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 |
Definition
One langley is
- 1 thermochemical calorie per square centimetre,[2]
- 41 840 J/m2 (joules per square metre)[3]