## 1.2 Physical Quantities

### Physical Quantity

1. A physical quantity is a quantity that can be measured.

2. Physical quantities are usually expressed as the product of a numerical value and a physical unit

Example

2.34 x 102kJ

where

· E represents the physical quantity of energy

· is the numerical value

· k is the SI prefix kilo representing 103

· J is the symbol for the unit of energy, the joule

A physical quantity can be divided into base quantity and derived quantity.