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Pressure in Fluids

Pressure is force per unit area and increases with depth in an incompressible fluid.

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Pressure in Fluids: Pascal, Archimedes and Buoyancy

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Pressure in Fluids: Pascal, Archimedes and Buoyancy


Fluid particles are constantly moving; not as much as a gas but more than a solid. This constant movement that bumps into other things, like the walls of a container, which we call pressure. What is the SI unit for pressure?

Pressure is officially defined as the amount of force per unit area. Given this, will the pressure be greater or smaller if the same force is disperesed over a larger area rather than a smaller area?

For answers and a sample problem, click here.

Pascal's Law

Atmospheric pressure acting on a fluid is transmitted throughout that fluid. Describe how this can be applied to Pascal's principle based on the diagram below.

License: CC BY-NC 3.0


Write an equation relating the areas to A and B and the forces applied on them.


Archimedes' Principle

Objects in water have to move water out of the way to sink. The amount of fluid an object displaces is equal to what measurement?

Archimedes' law states that buoyant force is equal to the weight of the fluid it displaces. Describe how this is applied in real life. How does this law help explain why some objects float while others don't?


Combined Gas Law

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Using the above equation, derive the three relationships that the combined gas law is based off of: Boyle's Law, Charles' Law, and Gay-Lussac's Law. 

For the answers and a sample problem, click here.

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