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Particles in a solid are in perpetual motion because they possess kinetic energy due to their constant vibrations and oscillations. The particles may also have rotational and translational motion, even though they are closely packed together in a fixed position. This motion is a result of the thermal energy within the solid, which causes the particles to continuously move.
In a solid, particles are indeed closely packed together, but they are not completely motionless. The particles still have vibrational motion around their fixed positions. This vibrational motion increases with temperature, causing the solid to expand as the particles move more vigorously.
Particles within are limited to vibrational motion, unlike the particles which make up liquids which can have vibrational & translational motion, and gaseous particles which have vibrational, translational and rotational motion.
a state of matter where particles are in constant motion to a state where particles slow down and arrange in a more ordered pattern, resulting in a solid form.
The particles in a solid are closely locked in position and can only vibrate.
I would describe it as this: All of the particles are tightly packed together with almost no spaces between them. Their motion is very limited, unlike that of a gas where the particles are spaced further apart and they are free to move around more.