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View submission: Is sand a liquid???
This is correct. Fluidization is what the phenomenon being discussed here is actually called, as a solid block of sand does not have any fluidlike properties. It only works when aeration is performed, which is an example of fluidization of particulate matter. The actual molecules in the sand do not maintain attractive forces to one another outside of each particle and do not have a surface tension or the ability to act as a solvent (common properties of liquids). Thus, it is fluidlike in its particulate form, but is a solid phase, and would not be considered a rheological fluid either.
There's nothing here!