So here is a random observation for some enterprising grad student or postdoc; is electric charge responsible for liquefaction on packaged solids?

Triboelectric charging is not well understood yet, it happens in dust storms and volcanic eruptions where charge is transferred to particulates from the air. As charge increases this results in "dry lightning" or other discharges.

If you wanted a research topic, I think you could look into the hypothesis of whether or not a powdered material could be charged to exhibit liquid properties.

Note that the way these bulk solids are loaded on to ships it typically by conveyor belt where they then drop through the air (charging opportunity) and then dropped into a conductive container (the hull of a steel ship).

If someone has looked into this already I'd love to read the paper on it.