Metre - Timeline of definition

The metre (Commonwealth English) or meter (American English) (symbol: m) is the SI base unit of length. It is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 of a second. Adding SI prefixes to metre creates multiples and submultiples; for example kilometre (1000 metres; kilo- = 1000) and millimetre (one thousandth of a metre; milli- = 1 / 1 000). Metre - SI prefixes applied to the metre. The metr ...

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• Metre - SI prefixes applied to the metre
• Metre - Conversions
• Metre - History
• Metre - Timeline of definition

Read more here: » Metre: Encyclopedia - Metre

The word metre is from the Greek metron (μετρον), "a measure" via the French mètre. Its first recorded usage in English is from 1797. In the 18th century, there were two favoured approaches to the definition of the standard unit of length. One suggested defining the metre as the length of a pendulum with a half-period of one second. The other suggested defining the metre as one ten-millionth of the length of the earth's meridian along a quadrant (one-fourth the polar circumference of the earth). In 1791, th ...

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Metre, Metre - SI prefixes applied to the metre, Metre - Conversions, Metre - History, Metre - Timeline of definition

Read more here: » Metre: Encyclopedia II - Metre - History

The metre may be used with some SI prefixes. ...

See also:

Metre, Metre - SI prefixes applied to the metre, Metre - Conversions, Metre - History, Metre - Timeline of definition

Read more here: » Metre: Encyclopedia II - Metre - SI prefixes applied to the metre