Bioengineering and biomedical engineering merge the disciplines of engineering, biology, and medicine to create techniques and devices that are based on an understanding of living systems and serve the objective of improving the quality of human and animal life.
Weight of 1 US Gallon of water = approx. 8.35 lb (about 3.785 kg). Weight of 1 Imperial gallon (i.e. UK measure) of water weighs 10 pounds (4.536 kg) by definition, at a specified temperature and pressure.
The hydrometer is calibrated to 1.000 for water. The approximate weight of water is 8.345 pounds per gallon. The approximate weight of a five gallon keg is 6 pounds but we don't care too much as we are really interested in the product weight.