The most common scale used in physical science is the International System of Units (SI). It's a standardized system that uses seven base units:

* Length: meter (m)

* Mass: kilogram (kg)

* Time: second (s)

* Electric Current: ampere (A)

* Temperature: kelvin (K)

* Amount of Substance: mole (mol)

* Luminous Intensity: candela (cd)

These base units can be combined to form derived units, such as:

* Velocity: meters per second (m/s)

* Force: newton (N)

* Energy: joule (J)

* Power: watt (W)

The SI system is used worldwide in scientific research, engineering, and other fields. It helps ensure consistent measurements and simplifies communication between scientists and engineers.

While other scales like the Imperial system are still used in some parts of the world, the SI system is the preferred system in physical science due to its standardization and ease of use.