Question

what is the definition of thermal energy
substances that thermal energy cannot move through
a type of thermal energy transfer in which currents carry thermal energy from one part of the fluid to another
tendency of particles to spread out when the kinetic energy increases
sum of the kinetic energies of all the particles that make up an object

Explanation:

Thermal energy is related to the motion of particles. The sum of the kinetic energies of all the particles that make up an object is the definition of thermal energy. The first option describes insulators, the second is about convection (a type of heat transfer), and the third is about diffusion - like behavior due to kinetic energy increase.

Answer:

sum of the kinetic energies of all the particles that make up an object