When the unit equals the physical quantity, the numerical value is 1. This is because the unit is defined as the amount of a physical quantity that is equal to one. For example, the unit of length is the meter, and one meter is defined as the length of a certain platinum-iridium bar kept at the International Bureau of Weights and Measures in France. If we measure the length of an object in meters, the numerical value of the measurement will be the number of meters that the object is long. For example, if an object is 2 meters long, the numerical value of its length is 2.