The two parts required to express the measurement of a physical quantity are:

1. Magnitude: This is the numerical value of the quantity. It tells you *how much* of the quantity is present.

2. Unit: This is a standard reference point for the quantity. It tells you *what kind* of quantity is being measured.

For example, if you measure the length of a table as "1.5 meters", then:

* Magnitude: 1.5

* Unit: meters

Without both parts, the measurement is incomplete.