OF the three answers thus far Grellis is the closest. Thus far no one has mentioned that differing substances each have different densities. You attempting to convert between mass in pounds and volume in quarts. You must consider the density of the substance being measured in quarts, all substances whether in liquid, solid or gas phase have differing densities, the formula for density is d=m/v which reads density=mass/volume.
therefore I would need the density of the substance being measured in quarts to convert to pounds - abbreviated as lbs.
therefore I would need the density of the substance being measured in quarts to convert to pounds - abbreviated as lbs.