Breathing involves differences in what, measured in torr, between the inside of the lungs and the air outside?

• Correct Answer: resistance
• temperature
• gravity
• pressure

Explanation: Breathing involves pressure differences between the inside of the lungs and the air outside. The pressure differences are only a few torr. A normal breath is about 0.50 L. If room temperature is about 22°C, then the air has a temperature of about 295 K. With normal pressure being 1.0 atm, how many moles of air do we take in for every breath? The ideal gas law gives us an answer:.

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