The pressure is less after a time.
I know that there is a way to justify it with calculus, but it's been a couple of years since I looked at that page that one time.
So, I'll justify it by gravity, which is probably taken in some way from the calculus.
Because the cream floats to the top, it is less dense than the substance it is in. Density is mass over volume, so there is either less mass at the top, or more volume. Either way, it is lighter on the top.
Weight is a function of mass and distance. The farther away from the core of the earth, the smaller effect gravity will have. While slight for our milk bottle problem, it is justifiable as well.
But gravity will not have as great an effect when most of the mass is lower. (I could also say that the potential energy is greater before time passes) Gravity pulls more on the top, but when it is comparatively lighter, it can not put as much pressure on the bottom.
So, the answer is "
less"
.
[Edited by zex20913 on 01-15-2004 at 05:28 AM GMT]
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