"Current practice is to use c0 to denote the speed of light in vacuum according to ISO 31. In the original Recommendation of 1983, the symbol c was used for this purpose." Quote from NIST Special Publication 330, Appendix 2, p. 45. بایگانیشده در ۲۰۱۶-۰۶-۰۳ توسط Wayback Machine.
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"Current practice is to use c0 to denote the speed of light in vacuum according to ISO 31. In the original Recommendation of 1983, the symbol c was used for this purpose." Quote from NIST Special Publication 330, Appendix 2, p. 45. بایگانیشده در ۲۰۱۶-۰۶-۰۳ توسط Wayback Machine.