The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. Explain the reason. [2 Marks]

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Solution

$∙$ Intermixing of particles of two different types of matter is called diffusion. [1 mark]
$∙$ The rate of diffusion increases with increase in temperature and decreases with decrease in temperature. [1 mark]
$∙$ Therefore, the smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

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Give reasons for the following observation: The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. [2 MARKS]

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