You just bought a ballon that is massless. You fill the ballon with
a gas that has a density of ρ = ρair/n1.
That is, the density of the gas in the balloon is 1/n1 that
of air. You fill the balloon up to a volume of V=n2V0.
If the tension T in the cord that keeps the balloon from flying away is
T = n3ρairV0g, then
what is n3? Note that n1, n2, and
n3 are unitless.
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