Changes

Various analogies have been used to demonstrate the minuteness of the atom:

Various analogies have been used to demonstrate the minuteness of the atom:

*A human hair is about 1 million carbon atoms wide.

*A human hair is about 1 million carbon atoms wide.

* A single drop of water contains about 2 sextillion atoms of oxygen (2 followed by 21 zeros, 2×10x21st and twice as many hydrogen atoms. ISBN 0-13-054091-9

* A single drop of water contains about 2 sextillion atoms of oxygen (2 followed by 21 zeros, 2×10x21st and twice as many hydrogen atoms. ISBN 0-13-054091-9 Science textbook, Page 32: "There are 2,000,000,000,000,000,000,000 (that's 2 sextillion) atoms of oxygen in one drop of water—and twice as many atoms of hydrogen."

}} Science textbook, Page 32: "There are 2,000,000,000,000,000,000,000 (that's 2 sextillion) atoms of oxygen in one drop of water—and twice as many atoms of hydrogen."

*An [[HIV]] [[virion]] is the width of 800 carbon atoms and contains about 100 million atoms total. An [[E. coli]] bacterium contains perhaps 100 billion atoms, and a typical human cell roughly 100 trillion atoms.  

*An [[HIV]] [[virion]] is the width of 800 carbon atoms and contains about 100 million atoms total. An [[E. coli]] bacterium contains perhaps 100 billion atoms, and a typical human cell roughly 100 trillion atoms.  

*A speck of dust might contain (3 trillion) atoms.

*A speck of dust might contain (3 trillion) atoms.