Which best describes thermal energy?
it is the difference between internal energies of two or more substances.
it is the sum of internal energies of two or more substances.
it is the portion of internal energy that can be transferred from one substance to another.
it is the portion of potential energy that can be transferred from one substance to another.

Option (c) is the correct answer.

Explanation:

Energy attained by an object due to the motion of it's particles is known as thermal energy.

Thermal energy is also known as the internal energy as it is the energy within the particles due to their motion.

Thus, we can conclude that it is the portion of internal energy that can be transferred from one substance to another best describes thermal energy.

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