It depends completely on the type of hardwood you are talking about. Both Quaking Aspen and Shagbark Hickory are classed as "hardwoods". Quaking Aspen weighs 700 lbs. per cubic meter. Shagbark Hickory weighs 1,377 lbs. per cubic meter. Yet, in both cases, you have a "cubic meter of hardwood".
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It depends on the specific weight of the special sort of stones. 1 cubic meter of water weighs 1 tonne.
7,874 kg
One ton
Depends. A cubic meter of WHAT? If it's a cubic meter of lead, it would weigh quite a bit. A cubic meter of air, not so much. The standard substance that is used to relate metric measurements to each other is water. The "gram" was defined as the mass (not weight, but similar) of one cubic centimeter of water at normal temperature. There are 1 million cubic centimeters in a cubic meter, so a cubic meter of water would have a mass of 1 million grams, or 1,000 kilograms, or 1 metric ton. To obtain the mass of 1 cubic meter of some other substances, simply multiply the specific gravity of the substance by the mass of a cubic meter of water.
"1 cubic meter" is a perfectly good 'quantity'. If the 'quantity' you want is the weight instead, then you need to know a unit weight or density for sand, in order to convert a volume to a weight.