GCSE Physics (AQA)

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Fluids

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Forces Pressure and pressure differences in fluids

Fluids

2:04 Fluids and Hydraulics
Spec 4.5.5.1.1
Previous Weight & Mass Next Calculating Pressure
  • Fluids are substances that flow and change shape to fit a container.
  • Liquids are fluids because they change shape to fit a container.
  • Particles in liquids are free to move and rearrange, allowing them to flow.
  • Examples of liquids as fluids: pouring a drink, water in rivers, water flowing from taps.
  • Gases are also fluids as they spread out to fill a container.
  • Gas particles are spread out and constantly moving.
  • Example of gases as fluids: gas in a balloon, air in a room, wind.
  • Fluid properties can be modeled using solids with small particles.
  • Solids themselves are not fluids as their particles don't flow or change shape.
  • Solids like a ball pit or a bucket of sand can behave like liquids when poured.
  • Other examples of modeling fluid particles: marbles, sugar, salt.
  • Important to identify when a substance is or behaves like a fluid.

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