The basic quantities of physics, also known as fundamental quantities, are the building blocks of all other physical quantities. They are considered independent and cannot be defined in terms of other quantities. Here are some of the most common:

1. Length (L): Describes the distance between two points. Its SI unit is the meter (m).

2. Time (T): Measures the duration of events. Its SI unit is the second (s).

3. Mass (M): Represents the amount of matter in an object. Its SI unit is the kilogram (kg).

4. Electric Current (I): Measures the rate of flow of electric charge. Its SI unit is the ampere (A).

5. Temperature (Θ): Measures the degree of hotness or coldness of an object. Its SI unit is the kelvin (K).

6. Amount of Substance (N): Indicates the number of elementary entities (atoms, molecules, etc.) in a substance. Its SI unit is the mole (mol).

7. Luminous Intensity (J): Measures the power emitted by a light source per unit solid angle. Its SI unit is the candela (cd).

These fundamental quantities are used to derive other physical quantities. For example:

* Velocity (v): Change in position over time (L/T).

* Acceleration (a): Change in velocity over time (L/T²).

* Force (F): Mass times acceleration (M*L/T²).

* Energy (E): Force times distance (M*L²/T²).

It's important to note that the choice of fundamental quantities is somewhat arbitrary and depends on the specific area of physics being studied. However, these seven quantities form a standard set used in many branches of physics.