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Technical Reference  Navigation:   HOME | technical reference overview > miscellaneous > miscellany > metres/seconds Metres & Seconds The metre (m) Since 1983, the metre has been defined internationally as the length of the patch travelled by light in a vacuum during 1/299,792,458th of a second. The second (s) A second is, in turn, defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. See also: Go back techref.info website © Copyright 2006-2012 Please read the Conditions of Use of this website. Need help? Go to Helpdesk