Question

what is the definition of thermal energy

1. tendency of particles to spread out when the kinetic energy increases
2. a measure of the average kinetic energy of an objects particles
3. a type of thermal energy transfer in which currents carry thermal energy from one part of the fluid to another
4. 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 entropy - related tendency, the second is temperature (average kinetic energy), and the third is convection (a mode of heat transfer).

Answer:

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