It depends upon the substance of the18 lb.
Weight and volume are linked by density:
density = weight/volume → volume = weight / density.
18 lb of Mercury occupies a much smaller volume than 18 lb of hydrogen.
That will depend on a gallon of WHAT. Gallon is a measure of volume, pounds are a measure of weight. They do not interchange. A gallon of water weighs more than a gallon of oil.
In 18 US gallons there are 68.1374121 litres
2.25 gal
Eighteen
Eighteen US GallonsEighteen US Gallons
42 gallons of water is 350.7 pounds
10 US gallons is approximately 83.5 pounds
30 pounds of water is 3.593 gallons.
About 250.5 pounds for 30 US gallons.
10 gallons of water is 83.5 pounds
800 pounds of water would be 95.8 US gallons.
That depends on what substance you have 227.5 pounds of.227.5 pounds of air fills many, many gallons.227.5 pounds of water fills about 27.2 gallons.227.5 pounds of granite fills only a few gallons.
18.5 quarts=4.625 gallons.