Class 7 Chemistry Heat Introduction

Introduction

It is from our day to day observation that in winter we feel cold whereas in summer we feel hot. People avoid getting out of their houses during the scorching summer due to excessive heat outside. When you boil water it becomes hot and is hard to dip finger in it but as soon as you blow off the flame and keep it aside for some time it gets easy to dip your finger.

Fig. Boiling Water

During fever our body gets hot but as soon as we take medicine the body becomes cool.

 

Ice melts when kept outside but remains in cold solid form as long as kept inside the deep freezer. Have you ever wondered what changes or phenomenon makes this happen.

It is all due to temperature.

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