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Yes, water does compress...
...so as the gravitational pull weakens then the ocean would expand.
Well...given enough force, then yes...but a LOT of force is required, and there is a limited result. Of course, in a sense, ALL matter is just empty space, (the space between the electrons and nucleus of atoms, for instance).... but that's more of a question for theoretical particle physics, not 'natural' physics, and materials science. Still, in the conditions being discussed?? You should consider water to be mostly uncompressible ... or so little as to be hard to measure.
Water density also depends on the amount of pressure, since pressure compresses water slightly, making it heavier. For studying how sound reflects off deep water layers, the pressure effect is relevant, but not for water circulation. The table on right shows how salt water compresses with depth. It is interesting to note that the ocean (average depth 4000m) would stand 36m higher if water were truly incompressible. (at 4000m, water is compressed by about 1.8%, averaging 0.9% for the whole water column, or about 36m.)
IF the Moon's influence were to be suddenly removed, the oceans would not 'expand'....the tidal actions woudl cease, eventually.
Seawater density from compression
Depth .... Density
0 m .... 1.02813
1000 .... 1.03285
2000 ... 1.03747
4000 ... 1.04640
6000 ... 1.05495
8000 ... 1.06315
10000 .. 1.07104