The 'INTERNATIONAL SYSTEM OF UNITS', abbreviated SI, defines the seven quantities listed in the picture below and the specific methods to build up a physical standard for each, called the unit, against which any other quantity of the same type can be compared. These quantities, are considered to be the building blocks of physics.They are used to express the laws of physics.


Derived Quantities

Many other quantities can be derived out of the combination of the basic quantities.
For instance a speed is the ratio of a length by a time.
An acceleration is the ratio of a speed by a time.
And a force is the multiplication of an acceleration by a mass. 

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