In very cold weather, a significant mechanism for heat loss by the human body is

Question

In very cold weather, a significant mechanism for heat loss by the human body is energy expended in warming the air taken into the lungs with each breath. Part A On a cold winter day when the temperature is -19.0 oC, what is the amount of heat needed to warm to internal body temperature (37 oC ) the 0.520L of air exchanged with each breath? Assume that the specific heat capacity of air is 1020J/(kg*K) and that 1.0 L of air has a mass of 1.3g . Part B How much heat is lost per hour if the respiration rate is 19.0 breaths per minute?

Explanation / Answer

a) (1020 [J/(kg•K)])(0.5 L)(1.3·10?³ kg/L)(37-?20 K) = 37.39 J. b) (37.39 J/breath)(20 breaths/min)(60 min/hr) = 4.53·104 J/hr.

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