Graham's law states that the rate of effusion of a gas is inversely proportional to the square root of its molecular weight. A balloon was leaking at some rate x, when filled with a gas of molecular weight m, give the leaking rate y, when filled with another gas of molecular weight n, at same temperature and pressure. More info: http://en.wikipedia.org/wiki/Graham%27s_law
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Set some matrix elements to zero
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