This document provides information about combustion and flames. It defines combustion as the burning of substances in air or oxygen with the evolution of heat and light. Combustible substances burn, while non-combustible substances do not. Three conditions are needed for combustion: oxygen, heat, and a fuel source. Fuels can be solid, liquid, or gas. Good fuels have characteristics like low ignition temperature and high calorific value. The document also describes soda-acid type fire extinguishers, how they work by releasing carbon dioxide gas when the acid bottle breaks, and their parts like the container and knob.

1. COMBUSTION
AND
FLAME
Made By :-
Vipul Kumar(42)
Class-8-B

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

3. 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

4. Conditions
Necessary for
combustion

6. Removing
the
combustible
substance
Cooling the
substance
below its
ignition
temperature
Cutting off
air supply

7. Fuels
Solid Fuel-
coal and
Wood
Liquid Fuel-
Kerosene and
Petrol
Gaseous
Fuel-coal gas
and Biogas

8. Characteristics of good
fuel
Have low
ignition
temperature
High 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

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

10. Parts of soda acid type
Fire extinguisher
The parts are
as follows:-
The
container
Bottle
Knob

11. 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.

12. 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

13. Diagram of soda-acid type fire
extinguisher

14. THANK YOU
THANK
YOU Submitted to
vaishali ma’am