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Q:

# What is the SI unit for distance?

A:

The SI base unit for distance is the meter, according to the International System of Units. From this base unit, using a system of equations, a number of derived quantities are obtained, such as area, volume, speed and acceleration.

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In 1791, the French Academy of Sciences first attempted the precise measurement of a meter by equating it to one 10-millionth of the Earth's meridian from a pole to the equator. Through the centuries, there were various attempts to make this measurement more precise. In 1983, the General Conference on Weights and Measures (CGPM) established the present definition. Currently, a meter is the length of the path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second.

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To convert a measurement of length in micrometers to meters, divide the number of micrometers by one million to get the distance in meters.

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A meter is approximately 39.37 inches long, the equivalent of 3.28 feet or 1.09 yards. It is also equal to 10 decimeters, 100 centimeters and 1,000 millimeters.

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There are supposed to be 1024 megabytes in a gigabyte, but manufacturers of computers and storage space round down to 1000 megabytes per gigabyte, since the prefix reflects the International System of Units. Because Windows adheres to the 1024 rule, 1 gigabyte storage devices appear to have 976 megabytes.