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.
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About 334 pounds for 40 US gallons.
1,000 US gallons is 133.681 cubic feet.
1 cubic foot = 7.48051948 US Gallons = 6.22883288 Imperial Gallons Therefore, 1000 cubic feet = 7480.51948 US Gallons = 6228.83288 Imperial Gallons
1000 pounds is exactly equal to 1000 pounds!
1000