There is no equivalence.
A pound is a measure of mass. A fluid ounce is a measure of volume. The two measure different things and,
according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider fluid ounce of air. How many pounds? Next consider a fluid ounce of molten lead. How many pounds?
The masses of equal volumes of the two substances will clearly be very different. So there is no direct conversion between mass and volume
: you need to know the density of the substance to enable you to carry out the conversion.
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