Originally Posted by **avito009** Basically Momentum = Mass * velocity
Share Momentum = Trade volume in a particular period * price change in that period.
Now Mass which is Trade volume in a particular period is a scalar but Velocity of Stock which is price change in that period is a vector.
So Momentum is scalar x vector= vector.
Since broadly ADX is a Momentum indicator it is a vector according to this logic. |

Broadly speaking this make some sense. But I'd drop the momentum analogy. A vector is a vector and momentum is only one example.

-Dan