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Apostilb ( unit symbol asb ) is an outdated unit of luminance of self-luminous bodies. In 1942, Blondel (unit symbol: blondel ) was proposed as a further name, the name was chosen in memory of the French physicist André-Eugène Blondel . A use or official definition of this name is currently not verifiable. Since 1978 the apostilb is no longer an official unit . It is a sub-unit of the Stilb (unit symbol:) and above it linked to the Lambert (unit symbol:) :

The corresponding SI unit is cd / (non-SI-compliant alternative designation: Nit (nt) ):

Web link

Individual evidence

  1. sizes.com: blondel , according to: Journal of the Optical Society of America, volume 32, pages 348-362.
  2. Peter Kurzweil, Bernhard Frenzel, Florian Gebhard: Physics formula collection for engineers and scientists . Vieweg, Wiesbaden 2008, ISBN 978-3-8348-0251-4 , pp. 4 .