mechanical equivalent of light
noun
The ratio of radiant flux to luminous flux, expressed in watts per lumen (= 0.0015 watt per lumen at 555 nm wavelength).
Origin
Early 20th century; earliest use found in Proceedings of the Royal Society of London.
- south half
- southing
- South Island
- South Islander
- South Jordan
- South Ken
- South Kensington
- South Kingstown
- South Korea
- South Korean
- southland
- Southland beech
- southlander
- south-like
- southly
- southmost
- southness
- south of the Bombay Hills
- South Orkney Islands
- South Ossetia
- South Pacific Commission
- South Pass
- southpaw
- South Platte River
- Southport