Chemistry Extinguisher class 8th .pptx

Its a handmadr ppt for school presentations . Types of fire exinguishers

1. FIRE EXTINGUISHER

2. A Fire extinguisher is a device in which carbon dioxide is produced in different forms to extinguish the fire. What is a fire extinguisher?

3. Fires are classified according to the type of fuel that is burning. If you use the wrong type of fire extinguisher on the wrong class of fire, you might make matters worse Its very important to understand the four different fire (fuel) classifications… Types of Fires

4. Types of Fire Class A : Wood, paper, cloth, trash, plastics—solids that are not metals. Class B : Flammable liquids—gasoline, oil, grease, acetone. Includes flammable gases. Class C : Electrical—energized electrical equipment. As long as it’s “plugged in.” Class D : Metals—potassium, sodium, aluminum, magnesium. Requires special extinguishing agents.

5. Types of Fire Extinguisher

6. Water Fire Extinguisher Should only be used in class A fires. Class A : Wood, paper, cloth, trash, plastics—solids that are not metals. The water cools the fire and extinguishes it

7. Form Fire Extinguisher Should only be used on class A and Class B fires. Class A : Wood, paper, cloth, trash, plastics—solids that are not metals. Class B : Flammable liquids—gasoline, oil, grease, acetone. Includes flammable gases . A foam fire extinguisher puts out fires by covering the flames with a thick blanket of foam.

8. Carbon dioxide Fire Extinguisher Should only be used on class B and Class C fires. Class C : Electrical—energized electrical equipment. As long as it’s “plugged in.” Class B : Flammable liquids—gasoline, oil, grease, acetone. Includes flammable gases . A foam fire extinguisher puts out fires by covering the flames with a thick blanket of foam.

9. Dry Chemical Fire Extinguisher A very versatile fire extinguisher, these are rated to be effective on Class A, B & C fires. Since Class A, B & C fires are the most common, dry chemical fire extinguishers are the most widely used in home fire situations. Dry chemical extinguishers put out fire by coating the fuel with a thin layer of dust, separating the fuel from the oxygen in the air.

10. Wet Chemical Fire Extinguisher This type of fire extinguisher was specifically developed for Class K fires that involve cooking oils and fats. often Class K fires occur in commercial restaurants and cafeteria settings… Wet chemical extinguishers are designed to fight Class F fires by forming a blanket on top of burning materials to suffocate and then cool the blaze. 

11. Clean Agent Fire Extinguisher Clean agent extinguishers are primarily for Class B & C fires. C fires involve electrical equipment, such as appliances, wiring, circuit breakers and outlets. Class B fires involve flammable or combustible liquids such as gasoline, kerosene, grease and oil. A clean agent fire suppression system uses either a chemical or inert gas to suppress a fire at the inception stage before it can grow

12. Dry Powder Fire Extinguisher Dry powder extinguishers are only for use in Class D fires. Class D fires involve combustible metals like magnesium, titanium, potassium and sodium. This type of fire might occur in a chemical laboratory .

13. THANK YOU!