# What is a meter based on the use of?

Jun 13, 2017

It comes from the value for the speed of light.

#### Explanation:

The speed of light in vacuum is defined to be

$299 , 792 , 458$ $\text{m/s}$

This means that light, in a vacuum, will travel a distance of $299 , 792 , 458$ meters in one second.

The definition of the length of the meter is defined from this value:

One meter is the distance light travels in a vacuum in exactly $\frac{1}{299 , 792 , 458}$ second.