
Concept explainers
(a)
The amount of heat leaving the body in a day only due to breathing.
(a)

Answer to Problem 31P
The amount of heat leaving the body in a day only due to breathing is
Explanation of Solution
Given that the volume of air breathed in one hour is
Write the
Here,
Solve equation (I) for
Write the expression for heat energy corresponding to temperature change.
Here,
Use equation (II) in (III).
Write the expression for molar specific heat capacity of a diatomic gas.
Use equation (V) in (IV).
Since the volume of air breathed in one hour is
Conclusion:
Substitute
Therefore, the amount of heat leaving the body in a day only due to breathing is
(b)
Whether the heat loss is significant, relative to the total heat loss from the body in one day.
(b)

Answer to Problem 31P
The heat loss is
Explanation of Solution
Given that the total heat loss from the body in one day is
Compute the fraction of the heat loss through breathing to the total heat loss.
Since the heat loss by breathing is about
Conclusion:
Therefore, the heat loss is
(c)
The average power due to breathing alone in a day.
(c)

Answer to Problem 31P
The average power due to breathing alone in a day is
Explanation of Solution
Given that the time duration is
Write the expression for the power.
Here,
Conclusion:
Substitute
Therefore, the average power due to breathing alone in a day is
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Chapter 14 Solutions
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