Maybe it is a number that you are âcarrying overâ to do a subtraction, or a persuasive argument that you are going to make as soon as the other person finishes talking. Either way, you are using your short-term memory.
The US gallon, which is equal to approximately 3.785 L, is legally defined as 231 cubic inches. A US liquid gallon of water weighs about 8.34 pounds or 3.78 kilograms at 62 Â°F (17 Â°C), making it about 16.6% lighter than the imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes a US gallon equal to 128 fl. oz.
Well, the density of water at 70degF is 8.329 lb/gal (from http://www.engineeringtoolbox.co...). So 8.329 lb/gal multiplied by 20 gallons comes out to around 166 lbs. This is the weight of the water that the (4) 5 gallon water bottles could displace, thus keep buoyant.