Page 66 - ScienceStd4

Chapter Four

Combustion
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Introduction

Combustion is a common process in our everyday lives.
In this chapter, you will learn about the meaning, causes
and effects of combustion. You will also learn various
ways to protect yourself from accidents that can occur
due to combustion. Similarly, you will also perform simple
experiments to investigate the importance of air (specifically
oxygen) in combustion. The competencies developed will
enable you to produce heat and light safely for various uses.
It will also enable you to protect yourself and others from

accidents caused by burning materials.

The importance and effect of
Think
combustion in daily life

Concept of combustion

Combustion is a process in which a flammable substance reacts
rapidly with oxygen. This reaction releases energy in the form
of heat and light, often producing a flame. Flames are visible

and feel hot during burning. For example, when firewood burns,
it combines with oxygen. This reaction releases heat and light.
Additionally, combustion produces carbon dioxide and water

vapour. This process is essential in many activities. These
include cooking food, melting metal and incinerating waste.

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