Abstract
The new definitions of seven SI base units, which are now based on their respective defining constants, were approved and adopted by the 26th CGPM. Candela, being one of the seven SI base units, was also redefined in terms of a defining constant, Kcd (maximum luminous efficacy of photopic vision). It is the only SI base unit which is derived from a physiological phenomenon of human vision. Candela has seen a long route of evolution from being defined on the basis of combustion candles to being now defined on the basis of a defining constant linked to a physiological phenomenon. This chapter traces the path of evolution of candela and future prospects of its definition.KeywordsCandelaPhotometryMetrologyQuantum photometry
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
