Re: effect of air pressure on water pressure

Hello, Jason.

You said that the cover is "partly across the surface of the water." If the pool is not 
totally covered, the pressure at the bottom of the pool will still be the sum of the 
water and atmospheric pressures. If the pool is fully covered and the air is all 
removed, then the pressure will depend only depth of the water.

I'm not quite sure what you are asking in the second question. My best guess is 
that you mean a glass full of water is submerged in a container of water, and the 
glass is held just below the surface. In that case, the atmospheric pressure will still 
be involved because the air is in contact with the water surrounding the glass. I'm 
sorry if I misinterpreted your question. Thanks,

Kevin