It is not concerned with the motions, forces and interactions of individual particles.
"The current is gone as well," Sisko said, seeing the difference in the particle motion.
One approach to the question is based on the motions of charged particles within electromagnetic fields.
"That's why we get macroscopic readings rather than the motion of individual particles."
We can follow the motion of particles from moment to moment as they interact with each other.
At 0 K there is no heat energy present and therefore no particle motion.
In zero field, there will be no net motion of charged particles because the system is not able to rotate.
Heat is thermal energy stored in temperature-dependent motion of particles.
Most ideas in physics, like the motion of particles or the behavior of waves, need getting used to.
By definition, Lamb waves have no particle motion in the y-direction.