Chuck Harris wrote: > David Dameron wrote: >> Hi all, >> I just realized that a meter is defined by the speed of light., see >> http://physics.nist.gov/cuu/Units/meter.html >> It is only to 9 significant digits, so if the speed of light (in some >> controlled environment) is measured more precisely than this, the meter and >> all other derived length units will change? >> >> (I was taught that 1 meter was 39.37 inches, to define the inch >> , but now I see more of 1 inch = 2.54 cm, as someone just referred to.) > > 1 meter/39.37 inches = 0.02540 meters/inch = 2.54 cm/inch = 25.4 mm/inch > > Exactly.
As long as exact means within a few parts per million: 1/meter/39.37 inches = 0.025400051 meters/inch ... > > -Chuck Harris _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
