Liquid Pressure Physics Project Class 8

Physics Project – Class 8 (2026–27)

Topic: Liquid Pressure

💧 Activity Based🚢 Submarine Concept📘 Project Ready✅ 20 Marks

PDFLayoutInstructionsIntroductionActivityWho Am I?Marking Scheme

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Cover Page

Physics Project – Class 8 (2026–27)

Topic: Liquid Pressure

Name:

Class & Section:

Roll No.:

Subject: Physics

School Name:

Teacher’s Name:

Layout of the Project

Cover Page

Index

Acknowledgement

Introduction (2–3 pages)

Activity

Applications in Daily Life

Who Am I?

Conclusion (Last Page)

General Instructions

• Use strip file
• Use blue or black pen only
• Draw proper margins
• Maintain neat and clean handwriting (no decoration required)
• Diagrams should be drawn or pasted neatly inside boundary.
• One Print out of activity

Teacher Tip: Students should keep the project neat, simple, and science-focused. The activity picture should be printed and pasted neatly.

Introduction: Liquid Pressure

What is Liquid Pressure?

Liquid pressure is the force exerted by a liquid on a surface per unit area. A liquid exerts pressure on the bottom and also on the walls of the container in which it is kept.

Why Does Pressure Increase with Depth?

As depth increases, the amount of water above that point also increases. This extra water has weight, so it pushes more strongly. That is why pressure is greater at greater depth.

Important Idea

Liquids exert pressure in all directions. This can be observed when water comes out from holes made at different heights in a bottle.

Observation from animation: Water from the lower hole travels the farthest because liquid pressure is greater at greater depth.

Activity (Any One)

Take a plastic bottle

Make holes at different heights

Fill water

Observation:

Conclusion:

Fill a balloon with water

Press from different sides

Observation:

Conclusion:

(Click picture, print and paste neatly)

Applications in Daily Life

Dams

Dams are made thicker at the bottom because water pressure increases with depth.

Submarines

Submarines use ballast tanks to go down and come up in water.

Water Tanks

Water pressure helps water flow through pipes from overhead tanks.

WHO AM I? ( Based on Submarine)

The PDF includes a submarine diagram explaining how a submarine dives and surfaces. The same image is included below so no visual from the PDF is missed.

To Dive (Go Down)

1. Water is allowed into the ballast tanks.
2. Weight of the submarine increases.
3. Submarine sinks and goes down.

To Surface (Come Up)

1. Compressed air is pumped into the tanks.
2. Water is pushed out of the tanks.
3. Weight of the submarine decreases and it rises up.

Fill in the blanks

I am filled with water to make the submarine go down → ____________

I am pumped into tanks to help the submarine come up → ____________

I increase when water enters the submarine → ____________

I am pushed out of tanks to make the submarine rise → ____________

I decrease when air fills the tanks and the submarine comes up → ____________

Marking Scheme (20 Marks)

Section	Marks
Presentation & Neatness	2
Cover Page & Diagrams	2
Introduction	5
Activity	5
Who Am I	5
Conclusion	1

The original marking scheme image from the PDF is also included below.

Quick Revision Quiz

1. Liquid pressure increases with:

2. A submarine goes down when:

3. Dams are thicker at the bottom because:

Conclusion (Last Page)

Liquid pressure is an important concept in Physics. Through this project, we learn that liquids exert pressure in all directions and the pressure increases with depth. The activities and submarine example help us understand how liquid pressure is used in daily life.

Physics Project – Class 8 | Topic: Liquid Pressure