Road salt can mean many things. Some cities/countries use sodium chloride, some use calcium chloride. Anti-caking agents like sodium ferrocyanide are added to prevent clumping.
That said, the weight of a volume of "road salt" be approximated by using using the density of ordinary salt, which is 2.165 grams per cubic centimeter.
After dimensional analysis, you get a rough estimate of 3,650 pounds per cubic yard.
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The weight of sea water really depends on a number of variables, including the temperature, the amount of salt (salinity) and whatever other foreign items may be present, and the depth, thus the pressure. But to get to the basic answer, seawater, at the surface, on average weighs 1027 kg/m3, or just over 64.1 lbs per cubic foot. ----------- The question is another way of asking for density of salt water. Salt water has greater density than that of fresh water, due to the dissolved salt. Fresh water has a density of 1000 kg/cubic meter vs. an average density of 1027 kg/cubic meter for ocean salt water.
The density of salt is around 2.16 grams per cubic centimeter.
The stowage factor of bulk salt can vary depending on its form and density, but on average it is around 0.85 to 1.2 cubic meters per ton (m3/t). This means that 1 ton of bulk salt will occupy approximately 0.85 to 1.2 cubic meters of space when stowed on a ship.
There are approximately 4,860 pounds of salt in 2 cubic yards.
There is no direct conversion between weight (pounds) and volume (cubic feet) as they are different units of measurement. The volume of an object is determined by its dimensions and shape, not by its weight.