What is the direction of air pressure on a vertical wall?

Perpendicular to the wall

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parallel to the wall

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At same oblique angle to the wall

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No direction

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Solution

The correct option is D
No direction

Youmight be tempted to say that air pressure is perpendicular to the wall as the normal force is but think about a point inside a container of water. Will it make sense to say that pressure at that point has a direction? Think about it

We knew that pressure is compressive. Therefore, it does not make sense to attribute a direction to pressure. It is a scalar, quantity whose magnitude is the magnitude of normal force divided by the magnitude of area. Thus it has no direction.

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