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    Why is it, in sciencey terms please.
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    (Original post by zara_ruby)
    Why is it, in sciencey terms please.
    Thanks
    Water isn't entirely incompressible. Liquids in general have small compressibilities but over small changes in pressure we assume these to be negligible and model the fluid as incompressible. Compressibility decreases as you go from gas to liquid to solid as the molecules get closer together.

    Water has relatively strong intermolecular bonds (water is polar, and the O-H bonds lead to strong H bonding), hence the intermolecular distance is small. So there's not much space between molecules and it resists compression.

    Water is an unusual liquid in that its solid, ice, is less dense than the liquid, since he water molecules in ice form a specific lattice (from the molecules aligning the H bonds in adjacent molecules in a certain way), that means the molecules are more spread out than in the liquid.

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