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a gallon
find an empty gallon of milk bottle. There you are.
A US gallon of water is 8.35 pounds. An Imperial gallon of water is 10 pounds.
Exactly 30 US gallon.
One gallon of water is 8.345404 Lbs.So a 100 gallon tank would have 834.5404 lbs of water.
a gallon or so
Fish Oil has a specific gravity of .92. Therefore, if a gallon of water weighs 8.64 lbs, standardized fish oil weighs 7.69 lbs.
Zero as you can not make a gallon of gasoline from water.
Your fishbowl is not suitable for keeping fish in. Far better you use it as a Vase. The minimum water requirements for fish are 1 inch of fish needs at least 1 gallon of water. If you want young fish to grow out properly you will need to do much better than 1 gallon to 1 inch and make it more like 3 gallons to the inch.
2 quarts
One gallon of water
How much gravel for 200 gallon tank