Question

What is pressure? What causes pressure?

   What is pressure? What causes pressure?

Chemistry A Molecular Approach

Chemistry A Molecular Approach

Nivaldo J. Tro 3rd Edition

Chapter 5, Problem 1

Instant Answer

Solved by Expert Eugene Schneider

03/17/2019

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It is a scalar quantity, meaning it has magnitude but no direction. Show more…

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What is pressure? What causes pressure?

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Key Concepts

Pressure

Pressure is a measure of the force applied perpendicular to the surface of an object per unit area. It quantifies how concentrated the force is on a given area and is measured in units like Pascals (Pa) in the International System of Units (SI).

Force and Area Relationship

The concept of pressure relies on the relationship between force and area. When a force is applied to a surface, the effect of that force depends on how widely it is distributed. A smaller area with the same force will result in higher pressure, while a larger area will result in lower pressure.

Molecular Collisions

In fluids (liquids and gases), pressure is caused by the collisions of molecules with the surfaces of their container or with each other. These collisions transfer momentum and exert force over an area, resulting in the measurable property of pressure even though the individual molecular forces vary in direction and magnitude.

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