You convert everything to a common unit, for example meters, multiply length x width x height to get the volume, then multiply this volume by the density of copper, which you can easily look up. - Actually this will give you the mass, not the weight. If you really want the weight, you can multiply the mass by Earth's gravity - about 9.8.
Alternately, you can weigh a sample.
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150*150*10thk h beam weight per meter
"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.
You cannot use a measure of area to calculate its weight.You need a third dimension to first calculate the volume and then convert to weight by knowing the density of the soil.If you have a depth of one meter there is one cubic meter and soil has a density of about 1,3 so your cubic meter of soil weighs 1,3 tonnes.
Use the formula 4.5*t(OD-t)/1000
The mass of paper is usually given as grams per squaremetre. You still need to provide the width to calculate the mass, and from there to calculate the weight.