Metre is the standard spelling of the metric unit for length in nearly all English-speaking nations, the exceptions being the United States and … See more

Universal measure: the metre linked to the figure of the Earth
Galileo discovered gravitational acceleration to … See more

SI prefixes can be used to denote decimal multiples and submultiples of the metre, as shown in the table below. Long distances are usually expressed in km, astronomical units (149.6 Gm), light-years (10 Pm), or parsecs (31 Pm), rather than in Mm or larger multiples; … See more

• ISO 1 – standard reference temperature for length measurements
• Metric prefix
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The etymological roots of metre can be traced to the Greek verb μετρέω (metreo) ((I) measure, count or compare) and noun μέτρον (metron) (a … See more

In France, the metre was adopted as an exclusive measure in 1801 under the Consulate. This continued under the First French Empire until 1812, when Napoleon decreed the introduction of the non-decimal mesures usuelles, which remained in use in … See more

Within this table, "inch" and "yard" mean "international inch" and "international yard" respectively, though approximate conversions in the … See more