Which mechanism of forced instability is defined as air moving into a low pressure system causes air to rise?

Convergence

Explanation:

Convergence is defined as the mechanism of forced instability which involves air movement into a low pressure system causes air to rise. This usually occurs with an increase in temperature which causes the air to expand which aids its vertical movement.

The air then cools off and water vapor condenses which gives rise to the precipitation we experience from time to time. This ensures that the water cycle is a continuous one.