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actually in the airsac that is between the inter and outer membrane has 0% humidity air molecules are smaller then water molecules and the pores in the egg shell and membrane are the right size to keep water out this allows the chick to build strength in its lungs
If that were the case (and Im just speculating here, because I really dont know), then why do directions for incubating state to keep the humidity at anywhere from 30-60%, so that the egg doesnt evaporate too much? Isnt evaporation water molecules at some point?