How many 600 mm in a metre

The relationship between the meter and the millimeter is constant however. Prior to this definition, the meter was based on the length of a prototype meter bar.

In , the meter has been re-defined based on the changes made to the definition of a second. Definition: A meter, or metre symbol: m , is the base unit of length and distance in the International System of Units SI. This definition was slightly modified in to reflect changes in the definition of the second. The meter is widely used in most countries and is the official unit for medium lengths and distances for example, road signs in continental Europe show maximum vehicle hight in meters.

Primary exceptions are the United States of America, and some countries where feet and yards are used in limited extent: the United Kingdom and Canada, where the yard remains in limited use as a part of imperial system for example, yards are used on road signs for shorter distances in the United Kingdom and feet are widely used in construction and real estate in Canada.

As a result of the French Revolution in , the old units of measure that were associated with the monarchy were replaced by the new units. The new unit of length was introduced which became known as the meter. The meter gained popularity in continental Europe during the nineteenth century, particularly in scientific field, and was officially adopted as an international measurement unit in The millimetre is sometimes verbally abbreviated to 'mil' - which can cause confusion in the US as there is a unit there that means thousandth of an inch.

Originally defined in as one ten-millionth of the distance from the equator to the North Pole but was redefined in in terms of a prototyped metre bar this bar was changed again in In the current definition was adopted and it is now the most common unit in any property in the world and is used in thousands of formulae to describe countless characteristics.

Quick Rough Maths. To get the Metres, divide the number of Millimetres by 1,