We describe the regeneration of the action potential down the membrane of the axon of the neuron as

The regeneration of the action potential inside the membrane of the neuron's axon is called the hyperpolarization conduction or propagation conduction. Hyperpolarization takes place when the membrane of the cell is in a negative charge. It therefore stimulates action potentials to increase its stimulus.

Particles of a solid are tightly packed together and usually have a regular pattern while liquid particles have no pattern and are less close together as solid ones