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.
Actually, a pint of water weighs 1.04375 pounds. So, although this phrase does not provide the EXACT weight of each liquid, it does provide a very simple rule for determining approximately how much liquids weigh. In the case of water, there are eight (8) pints of water in a gallon. Using this rule, a gallon (eight pints) would weigh approximately eight (8) pounds, which is very, very close to a gallon of water's exact weight of 8.35 pounds which is found in the more detailed and scientifically correct answers to this question.