Question

Why final temperature in irreversible process is more than reversible in adiabati

Answer 1

Just to correct your question, generally during reversible adiabatic expansion process, for a given range of pressure, final temperature is greater than corresponding irreversible process. For compression, exactly opposite happens (i.e. irreversible process results in higher final temperature).

Answer 2

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Why is the final temperature of areversible adiabatic process greater than that of irreversible? A reversible adiabatic process means that thetemperature is kept at a constant one, while an irreversible process implies that there is entropy phenomena where there is decreasing heat transfer (from hot to cold).