Question

how are particles in a solid like people sitting in a movie theater

Answer 1

In a solid, particles are densely packed and close to each other with minimum movement and form a regular pattern. In a movie theater, people sit in rows in a regular pattern. They are also very closely seated to each other with restricted movement. Thus, particles in a solid are like people sitting in a movie theater.

Answer 2

The particles in a solid are packed together. They form a regular pattern. Similarly people sit very close to each other in proper rows in a movie theater.

The particles in a solid are positioned very closely and can vibrate only in their place. In the same way people sitting in a movie theater cannot move much. Movement is restricted in both of them.