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Why ice is lighter than water? Hydrogen bonding gives ice a rather open structure with wide holes. Thus for same volume of water and ice , ice has less mass so it is lighter than water.
atoms in a drop of water = 3 atoms/molecule x 1.67 x 10 21 molecules; atoms in a drop of water = 5.01 x 10 21 atoms; Or, there are about 5 sextillion atoms in a drop of water. Atoms in a Drop of Water vs. Drops in the Ocean. One interesting question is whether there are more atoms in a drop of water than there are drops of water in the ocean. To determine the answer, we need the volume of water in the oceans. Sources estimate this to be between 1.3 billion km 3 and 1.5 km 3.