Question

why water is not compressed

Answer 1

because their molecules are closely packed

Answer 2

Water is a (di)polar molecule. That means it has a negative end (the oxygen atom) and a positive end (the hydrogen atoms). The analogy is a magnet. Because of this polarity - and just like a magnet - the positive end is attracted to the negative end of nearby molecules. This attraction is called the Van der Waal forces -composed of the stronger dipole-dipole force and the weaker London dispersion force. The Van der Waal forces are also responsible for Hydrogen bonding. For a longer explanation,

When liquid, water molecules have sufficient kinetic energy to move around each other. They are moving around so quickly that they can momentarily form hydrogen bonds to four other water molecules. Thus, liquid water molecules are relatively close to each other - but there is still a bit of distance between each molecule. When compressed to 40 mPa, such as at the bottom of oceans, liquid water compresses by about 1.8%. Not very much, which leads to the general thought that water is incompressible.

Fun fact: when water freezes into ice, it actually is less dense than liquid water. This is because the molecules move so slow that they form hydrogen bonds with 6 other molecules. However, the six molecules cannot as close to each other, therefore lowering the density by about 9%. This explains why your soda can explodes open when you put it in the freezer and forget about it.

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