Manipulation of Heat and Work Equations

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SUMMARY

The discussion focuses on the manipulation of heat and work equations in the context of ideal gas systems. The equations in question are dW = -RT dV/V and dW = -RdT + RT dP/P, as well as dQ = C_V dT + RTdV/V and dQ = C_P dT - RT dP/P. The user Wilson95 seeks clarification on transitioning between these equations, with a specific mention of the relationship dV = d(RT/P) for the first equation set. The complexity of the second set remains unresolved in the discussion.

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  • Understanding of thermodynamic principles, specifically the first law of thermodynamics.
  • Familiarity with ideal gas laws and equations.
  • Knowledge of differential calculus as it applies to thermodynamic equations.
  • Concept of heat capacities, specifically C_V and C_P.
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Students and professionals in thermodynamics, mechanical engineers, and anyone studying the behavior of ideal gases in relation to heat and work equations.

Wilson95
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Dear all,

How do you get from the 1st equation to the 2nd?

dW = -RT dV/V

dW = -RdT + RT dP/P

Also, I’m trying to do the same for this additional pair below…

dQ = C_V dT + RTdV/V

dQ = C_P dT - RT dP/P

Thanks.
 
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Hi Wilson95, welcome to PF. It looks like you're assuming an ideal gas system; for the first set, note that

[tex]dV=d\left(\frac{RT}{P}\right)[/tex]

I'm not immediately seeing how to handle the second set.
 

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