Question

The atmospheric pressure
acts equally in all directions.Explain​

Answer 1

Answer:

Explanation:

Atmospheric pressure results in forces on objects, and the forces are “normal to” or perpendicular to the various parts of the surface of the objects. More precisely we talk about tangent planes to the surface of the object at every point. The forces from pressure are very nearly perpendicular to these tangent planes at all points exposed to atmosphere.

These perpendicular forces are the outcome of molecular collisions with the object in all directions. Those collisions that don’t individually act perpendicularly are on the average balanced by other collisions on the other side of a normal line to the tangent planes.

The overall result of this in Earth’s atmosphere is that horizontal forces produce some compression but otherwise add to zero on the object. That means that atmospheric pressure in calm air won’t produce horizontal accelerations on the object.

However, it doesn’t work this way with vertical forces. At lower points in the atmosphere pressure is higher. That means that downward forces on the top of any object in the atmosphere add to less than the upward forces on the bottoms of objects. This results in what are called buoyant forces

The net vertical force exerted by the atmosphere on an object will almost always be upward. This is why objects of low density (lower than the density of surrounding air), such as helium and hot air balloons rise in air.