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When you blow on the back of your hand with your mouth

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 11DQ Chapter 19

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 11DQ

When you blow on the back of your hand with your mouth wide open, your breath feels warm. But if you partially close your mouth to form an “o” and then blow on your hand, your breath feels cool. Why?

Step-by-Step Solution:

Solution 11DQ Step 1 of 3: When we blow on the back of our hand with our mouth wide open, our breath feels warm. Because, the body temperature is different from the surrounding. Step 2 of 3: Whereas if we partially close our mouth to form an “o” and then blow on our hand, our breath feels cool. Because when we close our mouth to form “o”; the air inside the mouth is forced through a smaller opening and then expands. The process is similar to the concept used in case of refrigerators. Air is compressed and then allowed to expand causing cooling.

Step 3 of 3

Chapter 19, Problem 11DQ is Solved
Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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When you blow on the back of your hand with your mouth

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