langley (flux)
| Symbol: | ly |
| Category: | Energy flux |
| SI Equivalent: | 697.5 W/m2 |
| Dimension: | MT-3 |
| Notes | |
| Named after the American physicist Samuel Pierpont Langley (1834-1906), the langley is roughly equal to half the surface density of solar radiation on earth. 1 langley (power) = 1 cal15/cm2-min | |
1 ly =
| Energy flux | ||
| Symbol | Unit Name | |
| 221.106 | Btu (IT)/h-ft2 | British thermal unit (IT) per hour per square foot |
| 221.254 | Btu (therm.)/h-ft2 | British thermal unit (therm.) per hour per square foot |
| 697.5 | W/m2 | watt per square meter |
