Discussion
Which statement about the dry adiabatic lapse rate is FALSE?
Answer: A
Correct answer: It varies from day to day with the weather
This is the false statement. The dry adiabatic lapse rate is a constant of about \( 9.8 \) degrees per kilometre, following from thermodynamics - the rate at which an unsaturated parcel cools as it rises and expands against falling pressure. It does not change with the weather.
The other three are true: the value is about \( 9.8 \) degrees per kilometre, it describes a parcel raised without heat exchange, and it is compared with the environmental rate to assess stability. It is the environmental lapse rate that varies from hour to hour, and the whole stability judgement rests on comparing that variable profile against this fixed benchmark.
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