Question

find the word that matches the definition: tendency of particles to spread out when the kinetic energy increases thermal expansion thermal equilibrium thermal insulator conduction

Explanation:

Thermal expansion is the tendency of particles to spread out as their kinetic energy (due to increased temperature) rises. Thermal equilibrium is when two objects have the same temperature. A thermal insulator prevents heat transfer. Conduction is a method of heat transfer. Only thermal expansion fits the given definition.

Answer:

thermal expansion