Editing Centrifugal compressor (section)

=== Conservation of energy ===
The [[first law of thermodynamics]] is the statement of the conservation of energy. Under specific conditions, the operation of a Centrifugal compressor is considered a reversible process. For a reversible process, the total amount of heat added to a system can be expressed as <math>\delta Q=TdS</math> where <math>T</math> is [[temperature]] and <math>S</math> is [[entropy]]. Therefore, for a reversible process:
:<math>dU=TdS-pdV.\,</math>

Since U, S and V are thermodynamic functions of state, the above relation holds also for non-reversible changes. The above equation is known as the [[fundamental thermodynamic relation]].