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given a very long straw, and very strong lungs(superhuman ones), what is the highest one could suck a drink up this straw?
Human lungs can develop a vacuum of about 20 inH2O, IIRC. (that means the absolute pressure is about 380 inH2O). that also means you can't be more than 20 inches underwater if you want to breathe through a straw.
It's possible to develop more suction with your mouth, but in terms of the diaphragm, the ability to develop vacuum pressure is very limited.
given a very long straw, and very strong lungs(superhuman ones), what is the highest one could suck a drink up this straw?