I assume you want to find the volume of the gas cylinder
The pressure in the cylinder can be found from rho*g*(h1-h2)=P(atm)-P(gas)
where rho=specific grav. of mercury 13.6 gr/cm^3
h1,h2 are known
Knowing the gas pressure we can calculate the volume from Gas Law
PV=nRT where n= amount of gas in moles, T=temperature in K deg., R=8.3 J/(mol K) all assume known
V=nRT/P(gas) P(gas) is calculated above
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