Water is a polar compound. The electrons of water's hydrogen atoms are strongly attracted to the oxygen atom, and are actually closer to oxygen's nucleus than to the hydrogen nuclei; thus, water has a relatively strong negative charge in the middle (red shade), and a positive charge at the ends (blue shade).
Electrostatic force may exist between such molecules. In near proximity, the positive pole of one molecule will be attracted to the negative pole of another.
This type of force interaction between molecules is one type of intermolecular force. Dipole-dipole, hydrogen bonding and London dispersion forces are the three types of intermolecular forces. Intermolecular force is responsible for many of the physical and solubility properties of substances.
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