#حل_مسئله
#ترمودینامیک

🔏Consider two systems, with pressure P¹ and P² and temperature T¹ and T².
If internal energy ΔU is transferred from system 1 to system 2 and volume ΔV is transferred from system 1 to system 2 (see Figure),
find the change of entropy . Show that equilibrium results when T¹=T² and P¹=P² .

🛠 Necessary tools:

🔹first law of thermodynamics   :    dU=dQ+dW
🔹dQ=TdS       : only true for reversible changes
🔹dW=-PdV   : only true for reversible changes
🔹dU=TdS-PdV : always true
🔹dQ ≤ Tds ,dW ≥ -PdV :for irreversible changes

📚Concepts in Thermal Physics
👥Stephen J. Blundell and Katherine M. Blundell

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