A drop of water

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The ‘drop’ of liquid volume used on this site is 1/20 of a milliLiter or  .05 mL

A drop of water this size contains 1.67x1021  ( 1.67e21 on a calculator) molecules of H2O.

1.67 sextillion molecules  of H2O

in one drop.

If each molecule were enlarged to the size of a grain of sugar, the 1.67 sextillion molecules would form a spherical drop more than 9 miles across.  3 miles taller than Mount Everest.