From Wikipedia: "Since 1983, [the metre] is defined as the distance travelled by light in vacuum in 1⁄299,792,458 of a second." This is the currently used definition.
A meter is currently defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299,792,458 of a second.
A meter is defined as the distance travelled by light in free space in 1/299,792,458th of a second.
Until 1983 the metre was defined at one ten millionth of the distance from the equator to the north pole. That definition has changed to reflect greater understanding and knowledge. Originally, the meter was based on the distance between the equator and the north pole along the meridian that went through Paris. That distance was set at 10,000 kilometers and the metre was ten millionth of the distance.
The meter was defined by the French Academy of Sciences as the length between two marks on a platinum-iridium bar, which was designed to represent one ten-millionth of the distance from the Equator to the North Pole through Paris.In 1983, the meter was redefined as the distance traveled by light in free space in 1⁄299,792,458 of a second.
meter
Originally, a metre was defined as 1/10,000,000th of the distance from the Earth's equator to the North pole. Since 1983 it has been defined as:the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458th of a second.
the meter is defined as the basic unit of the metric unit.
the meter is defined as distance that travels 1/299792458
A meter is currently defined as the length of the path travelled by light in vacuum during a time interval of 1 / 299,792,458 of a second.
A meter is defined as the distance travelled by light in free space in 1/299,792,458th of a second.
As scientists study new areas the meter is involved in these new areas and new definitions in terms of the new areas are defined. The original meter was defined in terms of the earth studies, as electricity was studied, the speed of light became important and the meter was defined in terms of the speed of light. As science expands the definitions of the meter will expand.
Until 1983 the metre was defined at one ten millionth of the distance from the equator to the north pole. That definition has changed to reflect greater understanding and knowledge. Originally, the meter was based on the distance between the equator and the north pole along the meridian that went through Paris. That distance was set at 10,000 kilometers and the metre was ten millionth of the distance.
The meter was defined by the French Academy of Sciences as the length between two marks on a platinum-iridium bar, which was designed to represent one ten-millionth of the distance from the Equator to the North Pole through Paris.In 1983, the meter was redefined as the distance traveled by light in free space in 1⁄299,792,458 of a second.
A metre is defined as the distance light will travel in 1/299 792 458 seconds in a vacuum.
100cm
A meter is defined to be the distance travelled by light in 1/299,792,458 of a second.
The meter is defined as the distance traveled by ? in absolute vacuum in 1299792458 of a second.