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Sunday, February 6, 2011

the meter and the length-米和长度



The meter [m] is the international standard unit of length, approximately equivalent to 39.37 inches. It was redefined in 1983 as the distance traveled by light in a vacuum in 1/299,792,458 of a second.
Other units of length and their equivalents in meters are as follows:
1 millimeter = 0.001 meter [1 mm]
1 centimeter = 0.01 meter [1 cm]
1 decimeter = 0.1 meter [1 dm]
1 kilometer = 1000 meters [1km]

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