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# One Litre of Water Has 6.02 × 1026 Molecules. Estimate the Size of a Molecule. - Physics

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#### Question

One litre of water has 6.02 × 1026 molecules.  Estimate the size of a molecule.

#### Solution

The size of a particle (or molecule of matter is very small. 1 litre of water has 6.02 × 1026molecules, so the volume of a particle of water is
(10^-3"m"^3)/(6.0 × 10^26) = 1.6 × 10^-30 "m" ^3.
Thus the diameter of a water molecule is nearly 1.27 × 10−9 metre.

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