Basically you need more information. You can use the following formulae:
density = mass / volume
weight = mass x gravity
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You are trying to convert a unit of volume to a unit of weight. In order to determine the answer you would need to know the density of the object being measured. For example the density of water is approx. 1000 kg/m³
A liter is a unit of volume, not a unit of mass (or weight) like the pound. To convert between mass and weight, you need to know the density of a substance. The formula that relates volume and mass is: mass = volume x density You'll probably find density in units such as kilogram / liter (or the equivalent gram/cubic centimeter); if you use this in the formula, you'll get the mass in kilograms. You can then convert that to pounds.
volume = mass/density and density = mass/volume
convert 7850kg/m^3 into force
Volume = Mass/Density.So, if you know the density in terms of pounds per barrel, simply divide the mass by the density. If not, eitheruse dimensional analysis to convert the density from the given units to pounds per barrel, orcalculate the volume in the units used for the density and then conversion to barrels.