We know that cubic feet and pounds can't convert to each other, because we
have never, ever, heard a person say "I weigh xxx cubic feet". Also, no matter
how confusing the size and unit pricing of consumer goods gets, you have never,
ever, seen a little sign over a bin in the produce section in the supermarket that
says "$2.49 per cubic foot".
They don't convert.
"Cubic feet" tells you how much space there is in the box. "Pounds" tells you
the weight of the box and whatever is in it.
Take three identical boxes, each with the same number of 'cubic feet' in it. Fill
one with air, one with jello, and one with stones. Each one will weigh different
'pounds'.
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To convert cubic feet of water into pounds, use this conversion:
cubic feet of water x 62.4 = pounds
Note: This assumes a weight of 8.34 pounds per US gallon.
That cannot be done without knowing the specific gravity or weight of what is in the cubic feet.
You must have a specific gravity to do that . - ie a cubic foot of feathers is not the same weight as a cubic foot of iron.