Question

what decides whether the movement of air will be gentle breeze,strong wind Or a terrible storm​

Answer 1

The pressure gradient... More closer or concentrated are the isobars more speedy is the wind...speed of increases with increase in pressure gradient

Answer 2

The pressure gradient or pressure difference determines the movement of wind

The pressure difference is directly proportional to the speed of wind i.e, greater the difference stronger the wind.

Isobars are lines which connect two areas with same pressure on a map.By studying the isobars the speed of wind can be analysed