Give reasons for the following observation:

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close

 

Answer

We know that, the higher the temperature of a substance, the more will be its kinetic energy , and hence the faster it will travel. 

Since the temperature of hot food is more than cold food, the particles of matter surrounding the hot food would have more kinetic energy than the particles of matter surrounding cold food. 

The higher the kinetic energy, the faster they'll travel. 

Hence, the smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. 

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  1. Class 9
  2. Chapter 1 Class 9 - Matter In Our Surroundings

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.