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Why Does Blowing Over a Spoonful of Hot Tea Cools It? Does Evaporation Play a Role? Does Radiation Play a Role? - Physics

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Question

Why does blowing over a spoonful of hot tea cools it? Does evaporation play a role? Does radiation play a role?

Solution

Here, major role is played by convection. When we blow air over a spoonful of hot tea, the air coming from our mouth has less temperature than the air above the tea. Since hot air has less density, it rises up and cool air goes down. In this way, the tea cools down.
We know that any hot body radiates. So, the spoonful of tea will also radiate and as the temperature of the surrounding is less then the tea, the tea will cool down with time. Evaporation is also involved in this. On blowing over the hot tea, rate of evaporation increases and the cools down.

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APPEARS IN

 HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 6: Heat Transfer
Short Answers | Q: 3 | Page no. 96
Solution Why Does Blowing Over a Spoonful of Hot Tea Cools It? Does Evaporation Play a Role? Does Radiation Play a Role? Concept: Heat Transfer - Radiation.
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