Discussion
Assertion (A): The dry adiabatic lapse rate is a property of the atmosphere at a given moment.
Reason (R): It describes the cooling of a parcel raised without exchanging heat with its surroundings.
Select the correct answer from the options below.
Answer: A
Correct answer: A is false but R is true
The assertion is false. The dry adiabatic lapse rate is not a property of the atmosphere at any given moment; it is a fixed theoretical value of about \( 9.8 \) degrees per kilometre, following from thermodynamics and the acceleration due to gravity, and it does not change with the weather.
The reason is true and explains what the rate actually is: the cooling of a parcel raised without exchanging heat with its surroundings. The measured profile is the environmental lapse rate, which does vary from hour to hour; stability is judged by comparing the two.
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