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Understanding fluids and pressure concepts

Forces and motion • Pressure in fluids

Key concepts

What you'll likely be quizzed about

  • A fluid is any substance that can flow.
  • This includes both liquids, such as water and oil, and gases, such as air.
  • Fluids have no fixed shape and will take the shape of their container.
  • Them being compressible or incompressible depends on their phase; gases are compressible, while liquids are generally incompressible.

Flashcards

Test your knowledge with interactive flashcards

Why is pressure greater at greater depths?

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Pressure is greater at greater depths because of the cumulative weight of the fluid above.

Key notes

Important points to keep in mind

Fluids can be liquids or gases.

Pressure increases with depth in a fluid.

Pressure is force per area, calculated as P=F/A.

Gases are compressible; liquids are not.

Hydrostatic pressure depends on fluid density and depth.

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