That way, the further down you press the cap, the less air enters.

She could feel with him, the air entering his lungs.

But when he was born three months early, air wasn't even entering his lungs.

"Air enters at the top and presses the water down."

If there were no surface tension the air could easily enter into the glass.

It is through this part of the body that air from breathing first enters.

Every time you breathe in, air enters your nose and mouth.

Air may enter there and cause the wire to rust.

"Don't you recall that when we came in there was a draft of air entering from the outside?"

If air entered, then water would enter as well.