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How many metres in a kilometer

A kilometer is defined as 1,000 meters or 3,280 feet. The international standard metric unit of measurement is the meter, which is defined as the length of the path traveled by light in 1/299,792,458 of a second.A kilometer (km) is a decimal multiple of the meter, the International System of Units (SI) unit of length, approximately equivalent to 39.37 inches. A kilometer is now used officially for expressing distances between geographical places on land in most of the world with notable exceptions being the United States and the United Kingdom.

History/origin: Originally, in 1793, the meter was defined as one ten-millionth of the distance from the equator to the North Pole. This changed in 1889, when the International prototype metre was established as the length of a prototype meter bar (made of an alloy of 90% platinum and 10% iridium) measured at the melting point of ice. In 1960, the meter was again redefined, this time in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition of the meter is effectively the same as the definition that was adopted in 1983, with slight modifications due to the change in definition of the second.

The metre, or meter (US), is a measure of length. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes. The symbol for metre is m. Historically, the metre was defined by the French Academy of Sciences as 1/10,000,000 of the distance from the equator to the north pole through Paris. Now, it is defined by the International Bureau of Weights and Measures as the distance travelled by light in absolute vacuum in 1/299,792,458 of a second. This is approximately the distance from floor to hip bone on the average barefoot man. See all conversions for meters here. (Source: www.convertworld.com)

These two units are used in most parts of the world, with the notable exception of the United States where the imperial system is preferred. However, the official units used for road signs in theHistorically, the meter was first determined to be 1/10,000,000 of the distance from the North Pole to the equator back in 1793. Its modern definition has been in force since 1960, and is in relation to a certain number of wavelengths of a certain emission line of krypton-86.

Nowadays, it is the fundamental measurement unit according to the International System of Units (SI). The meter is defined as the distance light travels in a vacuum in 1/299,792,458 seconds1000). It is now the measurement unit used for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is the unit used. (Source: en.wikipedia.org)