Define standard meter.

Hint :To solve this question we have to know that, Meter is the standard spelling of the metric unit for length in nearly all English-speaking nations except the United States and the Philippines, which use meter.

Complete Step By Step Answer:
The standard meter is the length of the path travelled by the light in vacuum during a time interval of $ 1/299792 $ of a second. The meter is the length of the path travelled by light in vacuum during a time interval of $ 1/299792 $ of a second.
 $ 1 $ m is about $ 39.37 $ inches. This is a bit more than one yard. There are $ 1609 $ meters in a statute mile. Prefix multipliers based on powers of $ 10 $ are used to convert meters to other SI units. For example, there are $ 100 $ centimeters in a meter. There are $ 1000 $ millimeters in a meter. There are $ 1000 $ meters in a kilometer.

Note :
We know that, The meter is the basic unit of length in the SI system of units. The meter is defined to be the distance light travels through a vacuum in exactly $ 1/299792458 $ seconds. An interesting effect of the definition of the meter this way is that it fixes the speed of light in a vacuum to the exact value of $ 299792458 $ m/s. The previous definition of the meter was one ten-millionth of the distance from the geographic North Pole to the equator, measured over the earth's surface in a circle running through Paris, France. Meters are abbreviated using a lowercase "m" in measurements.