Amazing Air Pressure Demo | Water Stops with Just a Straw?!)

Terrific Physics
37 followers
Nov 13, 2025
what if i told you you can stop water with just air watch this
hello everyone today we want to show you how to stop water using just air we take a plastic water
bottle and make two holes one on the side and one on the top then we put a straw into them
side straw is taped tightly so it stays fixed the top straw is sealed with clay
next we place our hand over the side straw fill the bottle completely with water
and then screw the cap on tight while still covering the side the top straw is lower than
the side one no water comes out but if it's higher the water does flow out and that's all because of
air pressure water can only flow out if air can get in to replace it when the top straw
is higher than the side straw air enters and pushes the water out but if the top straw is
below the side straw no air can enter and the water flow stops
