Multiplying by unity
1g water = 1 cm**3 water <== at 4degC and 1atm, IIRC
2.54cm = 1 in(ch)
231in**3 = 1usgal <== this used to be exact, but is still pretty close
2.20462lb = 1kg = 1000g
so
1 = 1 g cm**-3
1 = 2.54 cm in**-1
1 = 231in**3 usgal**-1
1 = .00220462 lb g**-1
multiplying 1 by 1 by 1-cubed (1) by 1:
1 = (1 g cm**-3) * (.00220462 lb g**-1) * ((2.54cm/in)**3) * (231 in**3 gal**-1)
= 1 * 2.54**3 * 231 * .00220462 lb g g**-1 cm**-3 cm**3 in**-3 in**3 usgal**-1
(g g**-1), (cm**-3 cm**3), and (in**-3 in**3) all cancel out, leaving
1 = 8.345 lb/usgal
Zombie thread, I know, but also
For example , I am taking 32 TPH *2000= 64,000 lbs an hour. I am taking 64,000 *.02 ( for 2%)and determining that 1,280 lbs of this weight is water. We make our product at about 10% moisture , so the operator would select an additional 8% of water that would be an additional 5,120 lbs of water per hour.
if 2% (water/(dirt+water)) of 64k (dirt + water) 1 1.28k water, then 62.72k (= 64k-1.28k) is dirt, so to get 10% moisture i.e. 90% dirt requires 62.72k dirt * 10%/90% (water/dirt) = 6.969k moisture, less the 1.28k moisture already there, which means 5.689k water needs to be added, so that 5.12k is off by over 11%, but the moisture content would be about 9.2% instead of 10%
jes' sayin'