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Atomic kilometer

Colin wants to know how many atoms there are in a 1 km block. He knows there are more than 2,000, but he wants to know how many there really are.

Comments (4)

vinny:

In 1 square km of a city block, a 1 km cube of air or something else?

I can pretty much guarantee it's a LOT more than 2000.

Hmmm... let's assume a one-atom-thick square km.

vinny:

Let me put it this way: A 2L bottle of air contains about 1.07 x 10 ^ 22 atoms. That's 107 followed by 19 zeroes. Write it out. It's a big number.

It must have taken you a long time to count those atoms!

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