Sloshing is the back-and-forth movement of a liquid inside a container. It happens when the container is moved, tilted, shaken, or carried, causing the liquid to surge and splash against the walls. In the barometer context, sloshing describes the mercury moving inside the tube while the instrument was being transported.
In cyber security, sloshing is not a software attack term, but it matters in physical security, hardware testing, and industrial systems. Moving liquid can change sensor readings, create noisy signals, or reveal that a device has been disturbed. Defenders watch for these edge conditions because unusual behavior during motion can expose tampering, transport damage, or hidden faults that are invisible when a system is still. In investigations, sloshing is a reminder to test equipment in the states where it is actually used, not only in ideal lab conditions.