The equation of state is given by,

pV = nRT ……..(1)

Where, p = pressure

V = volume

N = number of moles

R = Gas constant

T = temp

\( \dfrac{n}{V} = \dfrac{p}{RT}\)

Replace n with \( \dfrac{m}{M},\) therefore,

\( \dfrac{m}{MV} = \dfrac{p}{RT}\)……..(2)

Where, m = mass

M = molar mass

But, \( \dfrac{m}{V}\) = d

Where, d = density

Therefore, from equation (2), we get

\( \dfrac{d}{M} = \dfrac{p}{RT}\)

d = \( (\dfrac{M}{RT}) p\)

d\( \propto\) p

Therefore, at a given temp, the density of the gas (d) is proportional to its pressure (p).

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