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Thermodynamics: Total Energy

As mentioned earlier total energy is the sum of all of the energies acting on and within the system. So that would mean the total energy of a system if the internal energy, kinetic energy, and potential energy of the system was known would be represent by equation 1.

Total Energy Equation (1)

U = Internal Energy

Ke = Kinetic Energy

Pe = Potential Energy


In some cases the total energy would be represented as total energy per unit mass; equation 2.

Total Energy per unit mass equation (2)

Now if a closed system was stationary that would mean that the kinetic energy and potential energy of the system would be zero. So any changes in energy would be a direct result of changes of the internal energy changing within the system. This type of system is known as a stationary system.

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