What does Momentum show?

The change in price over the last N bars.

How is Momentum built?

The current close minus the close N bars ago.

Above zero: price is higher than N bars ago. Rising values show momentum building. Zero crossings mark a change of direction over the period.

Oscillators

What it shows: The change in price over the last N bars.
How it is built: The current close minus the close N bars ago.
How to use it: Above zero: price is higher than N bars ago.
Rising values show momentum building.
Zero crossings mark a change of direction over the period.