combustion and flame ppt

COMBUSTION ANDFLAME

Made By :-Vipul Kumar

Rajora (42) and Soumitra Dwivedi (35)

Class-8-B

INDEX

Introduction Condition necessary for combustion Types of combustion Methods of Extinguishing fire Fuels Characteristics of a good fuel Fire extinguisher

Introduction

The process of burning of substances in air or oxygen with the evolution of heat and light is known as

combustion

COMBUSTIBLE SUBSTANCE

A substance that burns in air or oxygen to produce heat and light is called combustible substance

Example- paper and wood

NON- COMBUSTIBLE SUBSTANCE

A substance that does not burn in or oxygen is called non-combustible substance Example – stone and metal

Conditions Necessary for combustion

Presence of combustible substance

Presence of supporter of combustion

Heating the combustible substance to its ignition

temperature

Rapid combustion SpontaneousCombustion Explosion

Types of Combustion

Methods of extinguishing Fire

Removing the

combustible

substance

Cooling the

substance below its ignition

temperature

Cutting off air supply

Fuels

Solid Fuel- coal and WoodLiquid Fuel- Kerosene and PetrolGaseous Fuel-coal gas and Biogas

Characteristics of goodfuel

Have low ignition

temperatureHigh

Calorific Value

Has a moderate

rate of combustion

Safe to store ,handle

and transport

Does not cause

pollution

Leaves behind little

or no residue

after being burnt

Is cheap and easily available

Fire Extinguisher

The simplest fire extinguisher is soda –acid type dire extinguisherAnother type of fire extinguisher which contains carbon dioxide when open spread on fire and extinguish it.

Parts of soda acid typeFire extinguisher

The parts are as follows:-The container

Bottle

Knob

Structure of soda acid type

fire Extinguisher

The container of fire extinguisher is cylindrical in shape It contains sodium bicarbonate solution The small bottle contains sulphuric acid. The bottle attached to knob.

How it works ?

For chemical reaction to take place, the knob is

struck . The bottle breaks and sulphuric acid reacts with sodium bicarbonate

liberating large amount of co2 gas

THANK YOU

THANK YOUSubmitted to vaishali ma’am