An adult inhales approximately 12 times per minute, taking in about 500 ml of air with each inhalation. oxygen and carbon dioxide are exchanged in the lungs, but there is essentially no exchange of nitrogen. the exhaled air has a mole fraction of nitrogen of 0.75 and is saturated with water vapor at body temperature, 37°c. if ambient conditions are 25°c, 1 atm, and 50% relative humidity, what volume of liquid water (ml) would have to be consumed over a two-hour period to replace the water loss from breathing? how much would have to be consumed if the person is on an airplane where the temperature, pressure, and relative humidity are respectively 25°c, 1 atm, and 10%?

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative