1. The problem statement, all variables and given/known data If a person breathes 10 liters per minute of air at 68°F & 50% relative humidity, how much water per minute must the internal membranes supply to saturate this air at 98.6°F? If all of this moisture is subsequently exhaled, how much water per day is given off by the body in this process? If each gram of water extracts .58 kcals of energy as it is vaporized, how much daily heat loss in kcals (food calories) does this represent? 2. Relevant equations Saturation Vapor Density at 68°F = 17.3g / m3 Saturation Vapor Density at 98.6°F = 44.0g / m3 3. The attempt at a solution Yet another problem of subject matter our teacher has never touched on. I really don't understand how saturation and calories are even remotely associatable. We have some other values we need to plug in, so with any explanation on this problem, I should be able to work from there on the remaining problems.