Fire Extinguisher Experiment – Class 8 Science

A fire extinguisher is a device used to control or extinguish small fires, especially during emergencies. Fires need three things to keep burning: heat, fuel, and oxygen. A fire extinguisher works by removing one or more of these elements, stopping the fire.

Theory

The most common fire extinguisher is water-based. Water cools the burning material and lowers its temperature below the ignition point. However, water works only on Class A fires (wood, paper, cloth). It is unsafe for electrical fires or oil-based fires, because:

• Water can conduct electricity and cause electrocution.
• Water can spread oil and make the fire worse.

For electrical fires and inflammable liquid fires (like petrol), Carbon Dioxide (CO2) is preferred. CO2 is heavier than oxygen, so it covers the fire like a blanket and cuts off the oxygen supply. It also cools the burning material.

CO2 is stored under high pressure as a liquid and released as a gas. It can also be produced by chemicals such as sodium bicarbonate, which give off CO2 when heated.

Real Life Uses

• CO2 fire extinguishers are used in offices with electrical equipment.
• They are kept at petrol pumps to control oil fires.
• Chemical laboratories keep them because of flammable substances.
• In kitchens, dry powder or CO2 extinguishers are preferred for LPG fires.

Observations

• When using a fire extinguisher, CO2 is released, and flames reduce quickly.
• CO2 works by cutting off oxygen and lowering temperature, which stops the fire.

Types of Fire Extinguishers

1. Water
2. CO2
3. Dry Powder

Fire Extinguisher Experiment with Dencity

With the Dencity app, students of Class 8 science can perform the Fire Extinguisher Experiment virtually. Instead of handling real fire and chemicals, students explore how different extinguishers work in a safe, cost-effective, and interactive environment. The app helps them visualize:

• How water extinguishers cool down flames.
• How CO2 blankets fires and removes oxygen.
• Why dry powder is effective in kitchens.

This makes the concept not only safer but also more engaging for young learners.

Dencity for Teachers

Teachers can use the Dencity virtual lab to demonstrate the Fire Extinguisher Experiment interactively in classrooms. With features like:

• Interactive teaching tools.
• Real-time classroom collaboration.
• Ability to give students control during virtual experiments.

Dencity turns a regular science class into an interactive learning session. Teachers can also assign virtual homework, track progress, and give instant feedback.

Dencity on Interactive Touch Panels

The Dencity virtual science lab works smoothly on interactive classroom touch panels. Teachers can run simulations on a big screen, and students can directly interact with variables, making learning fun and highly engaging.

Contact Us

Educational institutions can contact Dencity for customized pricing or to request a demo of our virtual lab solutions.

Frequently Asked Questions (FAQs)

1. What is a fire extinguisher?
A fire extinguisher is a device used to put out small fires by removing heat, fuel, or oxygen.

2. Why can’t water extinguish oil or electrical fires?
Because water spreads oil and conducts electricity, making the fire worse.

3. Why is CO2 used in fire extinguishers?
CO2 is heavier than oxygen, so it blankets the fire and cuts off oxygen supply.

4. How is CO2 stored in fire extinguishers?
It is stored under high pressure as a liquid and released as a gas.

5. Where are CO2 fire extinguishers commonly used?
They are used in offices, petrol pumps, laboratories, and kitchens.

6. What happens when sodium bicarbonate is heated in a fire extinguisher?
It produces CO2, which helps put out the fire.

7. Which type of fire extinguisher is used in kitchens?
Dry powder or CO2 extinguishers are used for LPG and oil fires.

8. Can a fire extinguisher be reused after one use?
Yes, if it is a rechargeable type. Disposable ones must be replaced.

9. Why is interactive learning with Dencity better for this experiment?
It allows students to safely explore fire safety without real danger, making learning practical and engaging.

10. Does Dencity work on mobile and desktop?
Yes, the Dencity app works on Android, iOS, and desktops, making it accessible anywhere.

Explore science in a whole new way with the Dencity virtual lab – where learning is interactive, fun, and just a click away.