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International System of Units (view source)
Revision as of 14:25, March 31, 2008
, 14:25, March 31, 2008→Centimeter: not a base unit
It later had a definition dependent on a particular type of radiation. Today its definition depends upon the second and on the [[speed of light]] in a vacuum--which the CGPM now assumes to be constant. Thus a meter is 1⁄299,792,458th of a light-second. (Therefore the speed of light is exactly 299,792,458 meters per second.)
It later had a definition dependent on a particular type of radiation. Today its definition depends upon the second and on the [[speed of light]] in a vacuum--which the CGPM now assumes to be constant. Thus a meter is 1⁄299,792,458th of a light-second. (Therefore the speed of light is exactly 299,792,458 meters per second.)
=== Centimeter ===
==== Centimeter ====
The '''centimeter''' (or '''centimetre''') is one-hundreth of a meter. It is included here in its own category because it is a common unit of measure.
The '''centimeter''' (or '''centimetre''') is one-hundreth of a meter. It is not a base unit but is included here because it is a commonly used unit of length.
=== Kilogram ===
=== Kilogram ===