- The average adult human weighs approximately 70 kg (154 U.S. pounds) and is estimated to be composed of around seven thousand trillion trillion atoms. That is a seven followed by twenty seven zeroes: 7,000,000,000,000,000,000,000,000,000.
- According to the University of Hawaii the number of grains of sand on all of the beaches of the world is roughly calculated at around seven and a half quintillion – that is seventy five followed by seventeen zeros: 7,500,000,000,000,000,000.
- So if we divide the number of atoms in an average human body by the number of grains of sand on all of the beaches of the world we come to the stunning answer that it will take over 933 million planet Earths worth of beach sand grains to add up to the number of atoms in just one average adult person!
BBC – Atom
Episode 1: Clash of the Titans
Episode 2: The Key to the Cosmos
Episode 3: Illusion of Reality
... and if you enjoyed this series and are interested in other posts along these lines try Our Unfolding Science.