apostilb
Sign in to saveAlso known as blondel, asb
The apostilb is an obsolete unit of luminance. The SI unit of luminance is the candela per square metre (cd/m2). In 1942 Parry Moon proposed to rename the apostilb the blondel, after the French physicist André Blondel. The symbol for the apostilb is asb.
Wikidata facts
- Named after
- André Blondel
Show 5 more facts
- measured physical quantity
- luminance
- conversion to SI unit
- 0.3183098861837906715377675267450287240689192914809128974953346881177935952684530701802276055325061719121456854535159160737858
- discoverer or inventor
- André Blondel
- Wikidata SPARQL query equivalent
- wd:Q619941 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
- unit symbol
- asb
Sources (1)
via Wikidata · CC0
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Encyclopedic overview
3 sectionsContents
- Table of SI photometry quantities for reference
- See also
- References
The apostilb is an obsolete unit of luminance. The SI unit of luminance is the candela per square metre (cd/m2). In 1942 Parry Moon proposed to rename the apostilb the blondel, after the French physicist André Blondel. The symbol for the apostilb is asb.
The apostilb is defined in terms of another unit of luminance, the stilb (sb): 1 asb = 1/ ⋅ 10−4 sb asb = 1 cd/m2
Excerpted from Wikipedia’s “apostilb” article, available under the CC BY-SA 4.0 licence.