According to $P= \frac{F}{A}$, pressure reduces as area increase. But according to Bernoulli's principle $P$ reduces as velocity increase. But in nozzle velocity at reduced area is high and pressure is low but according $P= \frac{F}{A}$, $P$ should be high.
Which one is correct or please explain in simple way?
$P=\frac{F}{A}$ is merely the definition of pressure: force exerted per unit of surface area.
Bernoulli's principle, on the other hand, is an energy conservation equation for flowing fluids.
It's entirely pointless to compare the two.
But in nozzle velocity at reduced area is high and pressure is low [...]
The reduced area in that context doesn't correspond to $A$ in the definitional equation.
Agree that it is not wise to directly compare the two. Please use Bernoulli's equation to study or compare.
