Question

what is angular momentum

Answer 1

In physics, angular momentum is the rotational equivalent of linear momentum. It is an important quantity in physics because it is a conserved quantity—the total angular momentum of a system remains constant unless acted on by an external torque. Wikipedia
Derivations from other quantities: L = Iω = r × p
In SI base units: kg m2 s−1
Dimension: M L2 T−1