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Water is a polar molecular because of the nature of the atoms in its formula. The formula for water is H20. In a molecular drawing, an oxygen atom in the center is covalently bonded to a hydrogen on either side. Oxygen attracts electrons more than hydrogen can and this results in a positive charge on the hydrogen atoms and a negative charge on the oxygen atom. This causes water to have an electrical attraction to other water molecules, called a dipole moment. Hydrogen bonds form and break continuously between water molecules. The positive part of one water molecule is attracted to the negative part of another and so on. If one observes water dripping from a faucet, it appears to stretch due to the attraction of one molecule of water to the next. Cohesion takes place. A water molecule can form up to four hydrogen bonds because it can accept two and donate two hydrogen atoms.

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