



 
Hi Leonard, The equivalence of 1 cubic foot to 7.481 gallons is not dependent on the material. It is the same for liquids and dry materials. There may be a couple of problems with your experiment. Are you sure your "one gallon bucket" actually holds one gallon which is 128 US fluid ounces? If you still have your one cubic foot box then try it with sand or some other dry material that is fine grained. Part of the problem may be that you can't really fill the box or bucket with packing peanuts. There is a lot of air space between them. Harley  


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