There are 20.446 US tons (18.549 metric tons) in 4900 gallons of water.
Explanation: There are 8.3453 lbs (3.7855 kg) of water in a gallon, making about 40,892 lbs (18,549 kg). 1 US ton is 2000 lbs, 1 metric ton is 1000 kg.
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Of water one tonne
You cannot. A tonne is a measure of mass. A gallon is a measure of volume. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid. If you are not convinced, consider a gallon of air. How many tonnes (or grams)? Next consider a gallon of mercury. How many kilograms? The volume occupied by a gallon of air and of water will clearly be very different. So there is no direct conversion between mass and volume: you need to know the density of the substance to enable you to carry out the conversion.
The conversion rate of metric tons to gallons depends on the density of the substance being measured. Bunker fuel, a type of fuel oil used in ships, has a density of around 0.96 metric tons per cubic meter. Therefore, to convert metric tons of bunker fuel to gallons, you would need to know the volume in cubic meters and then use the conversion factor of 1 cubic meter being approximately equal to 264.172 gallons.
Around 4600 gallons. This answer is based on the chief engineer saying that it can travel for 12 days at 28.5 knots at which speed it used 380 tons/day in fuel.
Around 4600 gallons. This answer is based on the chief engineer saying that it can travel for 12 days at 28.5 knots at which speed it used 380 tons/day in fuel.