Question

thermal energy is defined as: *
the energy that is transferred between objects that have different temperatures.
the measure of the average kinetic energy of particles.
energy of an object due to its motion.
the sum of the kinetic energy of all the particles in a substance.

Explanation:

Thermal energy is the total kinetic energy of all particles in a substance. Energy transferred between objects of different temperatures is heat. Average kinetic - energy of particles is related to temperature. Energy due to an object's motion is kinetic energy of the whole object, not thermal energy.

Answer:

The sum of the kinetic energy of all the particles in a substance.