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anonymous
 one year ago
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!
anonymous
 one year ago
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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rvc
 one year ago
Best ResponseYou've already chosen the best response.0we know energy can neither be created nor be destroyed. It can be transformed from one form to another

rvc
 one year ago
Best ResponseYou've already chosen the best response.0Since energy keeps changing its form it remains constant

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.0dQ is heat added. That heat either causes work W to be done by system or increases its internal energy U.
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