I once had a book about the ocean that claimed that there was 38 pounds of gold in one cubic mile of seawater. You could figure 1 cubic kilometer from here but you are still left with the validity of the claim of the book and even worse, my memory of that book. Still, something to play with.
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The weight of 0.4 cubic feet depends on the density of the material. To convert volume to weight, you need to know the specific density. If we assume an average material density of 100 lbs/cubic foot, then 0.4 cubic feet would weigh 40 lbs.
One cubic inch of gasoline weighs approximately 0.4 ounces.
Assuming the density of water is 1000 kg/m3, 32 cubic meters of water would weigh 32,000 kg or 32 metric tonnes.
270lbs
The weight of a cubic meter of lentils can vary depending on factors such as size, moisture content, and variety. On average, a cubic meter of lentils can weigh between 700 to 800 kilograms.