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Thermodynamics: Total Energy

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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