I'd run across a demonstration of this somewhat recently. I believe it was a video explaining transitions between free-flowing and locked particles, though I don't recall specifically where, and was unable to find it looking for a few minutes just now.
That said: yes, vacuum-sealing good such as beans or coffee grounds provides a surprisingly solid chunk. Releasing the vacuum instantly changes the properties of the mass.
That said: yes, vacuum-sealing good such as beans or coffee grounds provides a surprisingly solid chunk. Releasing the vacuum instantly changes the properties of the mass.