Thermal energy is the total kinetic energy possessed by the system, by virtue of its molecular motion. It is a "property" of the system. Heat is an energy in transit, when there a is temperature difference between two systems. It is not "possessed" by a system, because it is a process function.
Thermal energy gives the total kinetic energy the system possesses. It is used to determine the internal energy of such system. In a system it increases with increase in temperature. Hence there would be the greater speed in molecular motion in the system.
Heat Energy is the flow of thermal energy between two objects of different temperature whereas the thermal energy tells about how much is the transfer of energy due to temperature difference between two bodies.
Energy transfer takes place by means of heat & work only in a thermodynamic system.
Heat Energy is defined as energy in transit due to temperature change.
Thermal Energy is defined as the internal energy stored in the system maintained at a certain temperature.
Ex:1)A body of mass 2 kg maintained at a temperature of 80C is kept in surroundings---Heat energy only is defined here.
2)A body of mass 2 kg maintained at a temperature of 80C is kept in a closed enclosure---
Thermal energy is defined here as Heat energy is 0 ,as there is no temperature change.
The difference between heat and thermal energy is that thermal energy is not in the process of being transferred; it is not in transit, but remains as part of the internal energy of the system; heat, on the other hand, is energy in transit, i.e. energy in the process of being transferred from a hotter system towards ...
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