And to reduce the size of the sand down until the weight of the sand micrometre 38 < did after crushing weight will be reduced by the quantity of sand to the size of the inverse processing of sand.
And reduce the size of sand into the <38 micron weight of crushed sand obtained after a quantity less by weight of sand inversely proportional to the size of the sand.
And when reducing the size of sand into the < 38), the weight of the sand after grinding is less quantity by weight and inversely proportional to the size of the sand sand