Hi, I do not quite understand the first law of thermodynamics. My books says that in thermodynamics you consider the mechanical energy as constant. Therefore only the internal energy can vary and thus : dU = dQ + dW (simplified). But I don't get how this means that the total energy in the system remains constant, because if dU is anything different from 0, there's a change in total energy, isn't there? I must be having a wrong view on this, could anyone help me out please? Thanks!
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we know energy can neither be created nor be destroyed.
It can be transformed from one form to another
Since energy keeps changing its form it remains constant
dQ is heat added. That heat either causes work W to be done by system or increases its internal energy U.