(thing) by Tannor Sat Nov 11 2000 at 4:42:57
Thomas Graham, a nineteenth century Scottish chemist, determined that at constant temperature, the rate of effusion of a gas in inversely proportional to the square root of its molar mass.

That is:

Rate of effusion of A
---------------------------- = sqrt( (molar mass B)/ (molar mass A) )
Rate of effusion of B
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