Explain what are two factors
that determine the thermal energy of a substan

The two factors that are mainly responsible for determining the thermal energy of a substance are Temperature and Mass.

Explanation:

Thermal energy is the total energy of the substance.

Temperature: The temperature and thermal energy of a substance are directly related to each other(direct proportion) which means that the greater the temperature, the greater will be the thermal energy of that particular substance.  

Mass: Consider a situation, if we have two or more substances that have the same temperature the substance with the highest mass will have the most thermal energy than the others.

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