Heck, salt (NaCl, hereinafter declared to be "salt") dissolves in the water and 'most other liquids you'd use for cooking (but it's insoluble in oil).

What is nice about salt is, that according to the Material Safety Data Sheets, it's not explosive.

Sand (silicon dioxide) isn't used to make table salt run free -- magnesium carbonate has been used for that since 1911. SiO2 is, however, used for other things that might surprise you. Read the labels.

Did you know that hydric acid is found in water throughout the world?