The lower end of a long plastic straw is immersed below the surface of the water in a plastic cup. An average person sucking on the upper end of the straw can pull water into the straw to a vertical height of 1.1 m above the surface of the water in the cup. What is the lowest gauge pressure that the average person can achieve inside his lungs?
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Based on our data, we think this problem is relevant for Professor Pau's class at UCLA.