Discussion
Assertion (A): The saturated adiabatic lapse rate is not a single fixed number.
Reason (R): The amount of latent heat released depends on how much vapour the air holds at that temperature.
Answer: A
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. The saturated rate is the dry rate offset by the latent heat released as vapour condenses, and warm saturated air holds far more vapour than cold, so it releases far more heat per unit of lifting. The rate is therefore about 4 degrees per kilometre in warm tropical air and approaches the dry 9.8 in very cold air, where there is almost nothing left to condense.
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