How much does a solid litre of sea salt weigh in kilograms?

Answer 1

Sea salt is a mixture of salts, so if you want a precise answer, you'll need the exact composition.

Otherwise assume it is all NaCl. Get the density of NaCl from a data table. Water has a density of 1 g / ml and has 1 kg. / liter. Convert your salt density to kg and you are done

Answer 2

Regular salt NaCl weighs 1.25 Kg/L,
sea salt must be a little more.