SHREE VALLABH SANSKAR DHAM’S
SMT. SHOBHABEN PRATAPBHAI PATEL
DAY BOARDING SCHOOL
Combustion & Flame
NOTES
STD:- VIII Sub:- Science
COMBUSTION: Combustion is a chemical process in which a substance reacts with oxygen to give off
heat. Some substances may also give light along with heat during combustion.
1. COMBUSTIBLE SUBSTANCE: A substance which can undergo combustion is called a
combustible substance. A combustible substance is also called fuel. It can be solid, liquid
or gas. Ex. Petrol, LPG, kerosene, paper etc.
2. NON-COMBUSTIBLE SUBSTANCE: A substance which cannot undergo combustion is
called a non-combustible substance. Ex. Water, glass, sand etc.
3. FACTORS/CONDITION REQUIRED FOR COMBUSTION:
a. A combustible substance
b. Oxygen
c. Ignition/kindling temperature: The minimum temperature at which combustion
starts in a substance is called ignition temperature of that substance.
4. INFLAMMABLE SUBSTANCE: A substance which has very low ignition temperature so
that is can easily catch fire is called an inflammable substance, e.g. petrol, alcohol, etc.
5. EXTINGUISHING FIRE: Fire can be extinguished by either of the following methods:
The burning substance or fuel can be removed.
Different methods can be utilized to cut off the supply of air.
If a suitable substance is poured over the burning material, which bring down the
temperature below ignition temperature.
Some common fire extinguishers: Water, Blanket, Carbon Dioxide, Soda - acid fire
extinguisher.
SMT. SHOBHABEN PRATAPBHAI PATEL
DAY BOARDING SCHOOL
Combustion & Flame
NOTES
STD:- VIII Sub:- Science
COMBUSTION: Combustion is a chemical process in which a substance reacts with oxygen to give off
heat. Some substances may also give light along with heat during combustion.
1. COMBUSTIBLE SUBSTANCE: A substance which can undergo combustion is called a
combustible substance. A combustible substance is also called fuel. It can be solid, liquid
or gas. Ex. Petrol, LPG, kerosene, paper etc.
2. NON-COMBUSTIBLE SUBSTANCE: A substance which cannot undergo combustion is
called a non-combustible substance. Ex. Water, glass, sand etc.
3. FACTORS/CONDITION REQUIRED FOR COMBUSTION:
a. A combustible substance
b. Oxygen
c. Ignition/kindling temperature: The minimum temperature at which combustion
starts in a substance is called ignition temperature of that substance.
4. INFLAMMABLE SUBSTANCE: A substance which has very low ignition temperature so
that is can easily catch fire is called an inflammable substance, e.g. petrol, alcohol, etc.
5. EXTINGUISHING FIRE: Fire can be extinguished by either of the following methods:
The burning substance or fuel can be removed.
Different methods can be utilized to cut off the supply of air.
If a suitable substance is poured over the burning material, which bring down the
temperature below ignition temperature.
Some common fire extinguishers: Water, Blanket, Carbon Dioxide, Soda - acid fire
extinguisher.
