Why didn't water entere the bottle?

[scientifico]

Hi,

I put an overturned bottle inside a container filled with 0.5 m of water but water didn't enter inside the bottle.
Pressure acting out the bottle when is immersed is air pressure plus water pressure at its height and pressure inside bottle is just air so why didn't water entered the bottle ? Is it about gravity ?

Thank you

 

[Low-Q]

Hi,

I put an overturned bottle inside a container filled with 0.5 m of water but water didn't enter inside the bottle.
Pressure acting out the bottle when is immersed is air pressure plus water pressure at its height and pressure inside bottle is just air so why didn't water entered the bottle ? Is it about gravity ?

Thank you

Air is compressible. Some water will enter the bottle, but not more than the water pressure allows with respect to the pressure and volume inside the bottle. 0.5m down in the water the pressure is only 1.049 bar, and the air above waterlevel is 1 bar. A difference of only 4.9%. However, you should see that some water enter the bottle.

Water pressure is a function of its mass and gravity. The deeper you go, the more mass are above you, the higher the pressure. If you submerge the bottle deep enough the pressure will fill the bottle with water almost completely. But still there is the same mass of air inside - just compressed into a very small space.

 

[scientifico]

So doesn't enter much water at 0.5 m because water compress air increasing its pressure ?

 

[jbriggs444]

So doesn't enter much water at 0.5 m because water compress air increasing its pressure ?

Not much water enters because 0.5 meters worth of pressure does not compress the air very much.

 

[PJC01]

for your question. The reason why water did not enter the bottle is due to a principle called atmospheric pressure. Atmospheric pressure is the weight of the air molecules in the Earth's atmosphere pushing down on the surface of the water. When you placed the bottle upside down in the water, the air inside the bottle was trapped and could not escape. This created a vacuum inside the bottle, meaning there was no air pressure pushing outwards. The atmospheric pressure outside the bottle was greater than the pressure inside the bottle, so the water was unable to enter. This is because the water would need to overcome the pressure difference in order to enter the bottle. Gravity does play a role in this process, as it is the force that pulls the water downward and creates the pressure difference. I hope this explanation helps to clarify why water did not enter the bottle.