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.
800 pounds of water would be 95.8 US gallons.
42 gallons of water is 350.7 pounds
5 Gallons of Jet A is 30 pounds
convert 20,000 gallons to pounds
10 US gallons is approximately 83.5 pounds
50 gallons of plain water weighs about 417 pounds.
Nine US gallons of water weighs about 75.15 pounds.
10 gallons of water is 83.5 pounds
30 pounds of water is 3.593 gallons.
20 gallons of water weighs 167 pounds.
Imperial gallons can't be converted to pounds. Imperial gallons measure volume, while pounds measure mass.
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).