How much does a gallon of rock salt weigh?

gallon rock Salt weigh
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How much does a gallon of rock salt weigh?

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So, in pounds, a chunk of NaCl (with no air space) would weigh 18.0260736 pounds…and, since the least precise term (presuming that “a gallon” is infinitely precise) was the density, that ought to be rounded to 3 significant digits: 18.0 pounds.