GCSE Physics (AQA)

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Pressure & Depth

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Forces Pressure and pressure differences in fluids

Pressure & Depth

2:16 Depth and Atmospheric Pressure
Spec 4.5.5.1.2
Previous Hydraulic Calculations Next Pressure of a Liquid Column
  • A liquid exerts pressure on submerged objects due to the weight of the liquid particles above.
  • Pressure is defined as force spread over an area.
  • Water exerts pressure on an ice cube due to the weight of the water pushing particles against it.
  • Pressure increases with depth; deeper objects experience greater pressure.
  • An ice cube at the bottom of a glass experiences more pressure than one floating at the top due to more liquid weighing down on it.
  • Pressure difference can be demonstrated by cutting holes in a water-filled cylinder; water is ejected with different trajectories due to varying pressure.
  • More pressure results in more force, causing water from lower holes to accelerate with more force.
  • This experiment may need to be explained in exams.
  • Divers need to be cautious of water pressure when diving, as pressure increases with depth.
  • At a depth of 10 meters, pressure increases by one atmosphere, doubling the pressure experienced at sea level.
  • High water pressure makes exploring ocean depths challenging.
  • More of the solar system has been explored than the Earth's oceans due to these challenges.

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