harry wrote:i have a tank that is 48 inches by 18 inches by 18 inches deep, how many gallons of water will it hold
Length x Width x Depth ÷ 231 = Gallons x 8.325625000001 Lbs per US Gallon = Weight of water
48 x 18 x 18 ÷ 231 = 67.324675324675 Gallons x 8.325625000001 Lbs per US Gallon = 560.520000000036 Lbs.
40 US Gallons = 333.025000000021 Lbs.
shill: It appears you were using the factor for pure water @ 4°C? A fish tank would probably be closer to 20°C, thus the difference in numbers/answers.