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 Originally Posted by wufwugy
i do not understand how they are calculating this.
if i learned the correct thing in chemistry, a mol of h20 is tiny (18 grams?) yet contains 6.022x10^23 molecules. it doesn't take that many mols for this number to be bigger than 10^81
lolwat.
10^81 / 10^23 = 10^(81 - 23) = 10^58 grams
water is 1 gram per cc.
1000 cc/L means 10^55 Liters of water. Divide that down to m^3, which means divide by another million.
(1 L is 10 cm on a side, 1 m is 1000 cm on a side. which means each side increases by a factor of 100, and 100^3 is 1 million)
So now that's 10^49 m^3 of water. :/ Lets go to (km)^3. So we'll divide by a billion.
10^40 (km)^3 of water is a lot of water.
The all the water on Earth is ~1.3(10)^9 (km)^3.
So 10^81 water molecules is, ya know, like enough water for 10 thousand billion billion billion Earths.
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