Page 38 - Genius Kidz Prudence Learning Sc-8

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Combustion and Flame

Combustion is a chemical process in which burning of substances takes place in the presence of air or oxygen so as to
produce heat and light or only heat. A combustible substance that produces heat and light on burning is called a fuel.
Flame is generated by those combustible substances which undergo vaporization on heating.

Discussion

Jack : Combustion! Burning! Oh Suzi : Jack ! these are just
ho ! what's this…… different names of the
Jack : You mean I can say that same thing.
c a n d l e i s s h o w i n g Suzi : Nup's ! It's like candle
combustion; I don't need catches fire… It is
to say candle is burning. burning. Fire requires

Jack : Yes ! I got it and wants to the presence of oxygen
learn more about flames, and it produces heat
fuel…. So more… so bye, and light in turn is
bye……my beautiful combustion.
chapter is waiting for me.

COMBUSTION example, wood, coal, paper, petrol,
Definition : Combustion is a chemical process kerosene, clothes, LPG, etc.
in which burning of some substance takes (2) Non-combustible substances : Substances

place in the presence of air or oxygen so as to that cannot burn in the presence of air to
produce heat and light or only heat. release heat and light energy are called
On the basis of the ability of substances to non-combustible substances, for example,

undergo combustion they can be of following mud, stone, glass, cement, stainless steel,
two types : marble, etc.
(1) Combustible substances : Substances that Conditions necessary for combustion
can burn easily in the presence of air or Several parameters are required to be present
oxygen to release heat and light energy are for combustion to take place. They include :

called combustible substances, for

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