That depends on the type material you are referring to. Also, these are two different types of measurements. Gallons is a measure of volume but the other is weight or mass. Please edit your question to include more context or details.
About 25 pounds for three US gallons of water.
Assuming the corn weighs 56 pounds per bushel as it should, 25 gallons (US, dry) is 175 pounds total weight.
It depends upon the size of the pelican and the sizes of the fish.
.25/1
42 gallons of water is 350.7 pounds
Water weighs 8 pounds per gallon. So, you would multiply 8 by 25 to get the result - you can do the math yourself.
It depends on what you have 12.5 gallons of. Water weighs 8.34 pounds per gallon. so 12.5 gallons x 8.34 pounds per gallon =104.25 pounrds. Gasoline weighs only about 6.2 pounds per gallon. 12.5 gallons x 6.2 pounds per gallon = 77.5 pounds.
10 US gallons is approximately 83.5 pounds
10 gallons of water is 83.5 pounds
30 pounds of water is 3.593 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.
4o pounds