Why Does the Chain Rule in Thermodynamics Include a Negative Sign?

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SUMMARY

The discussion centers on the chain rule in thermodynamics, specifically the equation $$\left(\frac{\partial P}{\partial T}\right)_V = -\left(\frac{\partial P}{\partial V}\right)_T \left(\frac{\partial V}{\partial T}\right)_P$$. The negative sign arises from the relationship between pressure, volume, and temperature, indicating that an increase in temperature at constant volume results in a decrease in volume at constant pressure. Understanding this relationship is crucial for thermodynamic analysis and applications.

PREREQUISITES
  • Understanding of thermodynamic principles
  • Familiarity with partial derivatives
  • Knowledge of state variables in thermodynamics
  • Basic grasp of the ideal gas law
NEXT STEPS
  • Study the derivation of Maxwell's relations in thermodynamics
  • Explore the implications of the Clausius-Clapeyron equation
  • Learn about the physical significance of state functions
  • Investigate the role of the Jacobian in thermodynamic transformations
USEFUL FOR

Students and professionals in physics and engineering, particularly those focusing on thermodynamics and fluid mechanics, will benefit from this discussion.

korialstasz
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I'm trying to understand why

$$\left(\frac{\partial P}{\partial T}\right)_V = -\left(\frac{\partial P}{\partial V}\right)_T \left(\frac{\partial V}{\partial T}\right)_P$$

where does the minus sign come from?
 
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What is dV(P,T) in terms of dP and dT?
 

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