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Pressure in Fluids and Atmospheric Pressure — Revision Notes

ICSE · Class 9 · Physics

Pressure in Fluids and Atmospheric Pressure revision notes for ICSE Class 9 Physics: 4 topics in quick points. Part of the ICSE Class 9 Physics syllabus.

42 questions35 flashcards12 formulas & key relations5 concepts

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A diagram illustrating the difference between thrust and pressure using a block placed on a surface. Show the same block exerting the same thrust (its weight) but different pressures depending on the
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Key Topics to Revise

1

1. Thrust, Pressure, and Units

  • Thrust is the force acting normally on a surface.
  • Thrust exerted by a body on a surface is equal to its weight.
  • Thrust is a vector quantity, while pressure is a scalar quantity.
2

2. Pressure in Fluids and Pressure Due to Liquid Column

  • A substance which can flow is called a fluid.
  • All liquids and gases are fluids.
  • A fluid contained in a vessel exerts pressure at all points and in all directions.
3

3. Pascal's Law and Hydraulic Machines

  • Pascal's law states that the pressure exerted anywhere in a confined liquid is transmitted equally and undiminished in all directions throughout the liquid.
  • Hydraulic machines work on Pascal's law.
  • A small force applied on a smaller piston can produce a large force on a larger piston.
4

4. Atmospheric Pressure and Barometers

  • The earth is surrounded by air up to a height of about 300 km from its surface.
  • The weight of air column exerts a thrust on the earth surface.
  • The thrust exerted per unit area on the earth surface due to column of air is called atmospheric pressure.

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Full Notes

Key Concepts

Thrust is the force acting normallyPressure is the thrust per unitPressure is given by P =A fluid is a substancePressure at depth h in

Frequently Asked Questions

What are the important topics in Pressure in Fluids and Atmospheric Pressure for ICSE Class 9 Physics?
Key topics in Pressure in Fluids and Atmospheric Pressure include Thrust, Pressure, and Units, Pressure in Fluids and Pressure Due to Liquid Column, Pascal's Law and Hydraulic Machines, Atmospheric Pressure and Barometers. Study these first, then practise questions on each for Class 9 exams.
How should I revise Pressure in Fluids and Atmospheric Pressure for Class 9 exams?
Learn the core ideas first, then work through the 42 practice questions on Pressure in Fluids and Atmospheric Pressure. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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