Pe2.1. a. if a breath of air, with a volume of 0.5 liter, is drawn into the lungs and comes to thermal equilibrium with the body at 37ºc while the pressure remains constant, calculate the increase in enthalpy of the air if the initial air temperature is 20ºc and the pressure is 1 atm.. (assume air, which is mainly n2 and o2, is an ideal diatomic gas with cv = 5r/2.)
b. at a breathing rate of 12 per minute, how much heat is lost in this fashion in 1 day?
c. compare your answer with a typical daily intake of 12,000 kj of food energy. what problems might you foresee in arctic climates, where the air temperature can reach –40ºc and below?
need with a, b and c