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Using the equation of state pV=nRT, show...

Using the equation of state `pV=nRT`, show that at a given temperature the density of gas is proportional to gas pressure `p`.

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`pV=nRT`
`p=W/(mV)RT=(rhoRT)/m`
where `W` is the mass of gas in gram, `m` is its molecular mass, and `rho` its density.
Hence density `(rho)` of a gas `prop P` because `R, T` and `m` are constant.
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