Does water pressure affect buoyancy?
In this experiment, you will observe the effect of increased water pressure on two buoyant objects floating in a closed bottle of water. The first is a flexible drinking straw filled with air and open at one end. The second is a flexible drinking straw filled with air and sealed at both ends. Because the first straw is open at one end, an increase in pressure allows water to easily force its way into the straw. This decreases the volume of water the straw displaces and it will eventually sink. Because the second straw is sealed at both ends, the water cannot force its way inside and must actually collapse the straw to decrease the displaced volume.
