It mostly comes down to the amount of bonds
Solid objects have connecting bonds that
holds each atom to the structure. To break a
solid object like a desk you have to break a lot
of bonds to do it. Liquids and vapors on the
other hand might have some bonds between atoms,
like H20 or N2. In these
cases the whole structure is not connected
together by these strong bonds, which allows a
freedom of movement of the atoms. This is
why you can easily push your hand through water or
Hope this helps.
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