That depends on the type material you are referring to. Also, these are two different types of measurements. One is volume the other is weight or mass. Please edit your question to include more context or details.
10 gallons of water is 83.5 pounds
10 US gallons is approximately 83.5 pounds
If water, 83.4 pounds.
1 US gallon of water is approximately 8.35 pounds. -1 Imperial gallon is approximately 10 pounds.
To convert gallons of water to pounds, you can use the conversion factor of 1 gallon of water = 8.34 pounds. So, if you have 10 gallons of water, it would weigh 83.4 pounds (10 gallons x 8.34 pounds/gallon).
42 gallons of water is 350.7 pounds
30 pounds of water is 3.593 gallons.
About 250.5 pounds for 30 US gallons.
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.
20 gallons of water weighs 167 pounds.
4o pounds