In thermodynamics, we define thermal energy as the internal (kinetic) energy of a system or the energy stored in the form of the movement of molecules of a body or a system. Thermal energy is directly proportional to the temperature of the system. This means the higher the temperature of a body, the faster the motion of the molecules inside it. This leads to an increase in the thermal energy of the body.
All the...
In thermodynamics, we define thermal energy as the internal (kinetic) energy of a system or the energy stored in the form of the movement of molecules of a body or a system. Thermal energy is directly proportional to the temperature of the system. This means the higher the temperature of a body, the faster the motion of the molecules inside it. This leads to an increase in the thermal energy of the body.
All the laws of thermodynamics apply to thermal energy as well. Also, like any other form of energy, thermal energy also has the ability to do work. For example, when you heat a metal container containing water, the molecules inside the metal start moving. Note that we cannot actually see these small particles moving inside the metal container, but we can feel an increase or decrease in its temperature. After this, these molecules transfer their energy to the water and we see rapid movement of the water molecules. Since it is the energy stored in the free moving particles inside the system, we say it is kinetic in nature.
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