What is the difference between heat and thermal energy? | Heat vs Thermal energy

The main difference between heat and thermal energy is that thermal energy is the sum of kinetic energy associated with the motion of the molecules in the system while heat is the flow of the thermal energy from the hotter object to the cold object.

Heat:

heat

Heat is the transfer of energy from one system to another system because of the presence of temperature differences between these two systems.

In simple words, heat is the energy in flow from the hot body to the cold body. The direction of this energy flow is always from the hotter object to the cold object.

Example: Heat transfer from the sun to earth.

Thermal energy:

Thermal energy

Thermal energy is the kinetic energy associated with the motion of the molecules in a system or object which is responsible for the temperature of the object.

Thermal energy is the property of the system that describes the particular state of the system.
As the temperature increases, the kinetic energy of the molecules also increases which results in an increase in thermal energy. Similarly, as temperature decreases, the thermal energy of the system also decreases.

Example: Thermal energy associated with sun because of the high temperature.

What is the difference between heat and thermal energy?

Sr. no.HeatThermal energy
1]Heat is the transfer of energy between two systems with different temperatures.Thermal energy is the kinetic energy of the molecules of the system because of the temperature of the system.
2]The heat becomes internal energy when it enters into the boundary of the system.The thermal energy becomes heat when it leaves the boundary of the system.
3]Heat is the process variable.Thermal energy is the property of the system.
4]The term heat is used to describe the process or path.The term thermal energy is used to describe the state of the system.
5]The heat is a result of the temperature difference between two objects.Thermal energy is responsible for the system’s temperature.

FAQ’s:

  1. How is heat and thermal energy different?

    The heat is the flow of the energy from the hotter system to the colder system while the thermal energy is the energy associated with the object because of the kinetic energy of the molecules.

  2. How thermal energy and heat energy are related?

    The relation between thermal energy and heat is that the thermal energy of the hotter object gets converted into heat energy when it comes in contact with the colder body and when the heat enters into the colder object it gets converted into thermal energy of the colder object.

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