Can U Paint A Microwave?

First law of thermodynamics (2)

To use simply the first principle génarélisé, a simplification of the derivative of the internal energy of the system is necessary. Two models are commonly used:

• evolution with steady flow (ERP), where the thermodynamic state of the system is assumed to be constant over time, without being uniform in the system: This model corresponds, for example in turbine operation in the long term
  
• evolution with uniform flow (USA), where the thermodynamic state of the system varies during the time but is uniform throughout the system: This model corresponds, for example filling a tank.