Consider this figure:

From there we get:

dS = d Q_R / T

d Q_R = T dS

Q_R = ²ʃ₁ T Ds

= area under the curve 1 – 2

= Heat transfer in the process.

• In x-axis we take entropy (s) and in y-axis we take Kelvin temperature (T).
• This is basically known as called T – 5 diagram.
• T 1 – 2 is a reversible process.

Links of Previous Main Topic:-

• Open system and control volume
• Conversion of work into heat
• Introduction to carnot cycle
• Clausius inequality entropy and irreversibility introduction
• Reversible adiabatic paths do not intersect
• Clausius theorem

Links of Next Mechanical Engineering Topics:-

• Clausiuss inequality
• Entropy change in an irreversible process
• Principle of increase of entropy
• The degree of irreversibility of and irreversible process
• Summary of first and second law by clausius  
• Practical use of entropy principle
• First law and second law combined
• Analysis of thermodynamic equations
• Ideal gas or perfect gas
• Introduction about air standard cycles
• Properties of pure substances introduction
• Vapour compression refrigeration cycle introduction
• Basic fluid mechanics and properties of fluids introduction

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