There are about 7 octillion atoms in the adult human body. The number of atoms in the human body is never constant, but an estimate can be calculated based on the average weight of a human adult and the average mass of an atom. An average human weighs 70 kilograms (about 154 pounds) and the average mass of an atom is a thousandth of a trillion of a trillion of 1 kilogram (0 followed by 27 decimal places). The calculation results in 7 octillion atoms or a 7 followed by 27 zeroes.
More about the human body:
Atoms are the smallest and most basic units of matter, made up of protons, electrons and neutrons.
99% of the human body is made up of hydrogen, oxygen and carbon.
The number of atoms in the human body is more than 100,000 times the number of known stars in the universe.
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