SOLUTION: Have firebox, 15" W 21" L and 4.5 D How many pounds of material do I need to fill? Thanks, Gary

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Question 257528: Have firebox, 15" W 21" L and 4.5 D How many pounds of material do I need to fill?
Thanks,
Gary
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
It depends on the material. You would need to know the density of the material (ie how packed in the molecules of that material are) to figure out how much that given volume of material will weigh.