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**meter**is the basic unit of length in theSIsystem of units. The

**meter**is defined to be thedistancelight travels through a vacuum in exactly 1/299792458seconds. Forexample, there are 100 centimeters in a

**meter**.There are1000 millimeters in a

**meter**.

In this way, how is a Metre measured?

The SI unit symbol is m. The **metre** is definedasthe length of the path travelled by light in a vacuum in 1299792458 of a second. The **metre** was originally defined in 1793asone ten-millionth of the distance from the equator to theNorthPole – as a result, the Earth's circumferenceisapproximately 40,000 km today.

**definition**.This

**defined**one

**meter**as one ten-millionth ofthedistance from the Equator to the North Pole. The

**definition**of a

**meter**has changed since 1791. Today, a

**meter**is“the length of the path travelled by light invacuum during atime interval of 1/299,792,458 of asecond.”

Consequently, what to use to measure meters?

**Meter** sticks are used to **measure**objectsthat are larger than a piece of paper. Remember that youcan**use** centimeters and millimeters if the object issmallerthan a piece of paper. Those items are easily**measured** witha ruler. A **meter** stick is a little over3 feet long, becausea **meter** is approximately 3.2feet.

Definition: 1 m is equivalent to 1.0936 yards, or39.370inches. Since 1983, the **metre** has been officiallydefined asthe **length** of the path travelled by light in avacuum duringa time interval of 1/299,792,458 of asecond.