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When environmental Lapse Rate (ELR) is equal to the Adiabatic Lapse Rate (ALR), then which of the following occurs?

(a) Sub adiabatic lapse rate

(b) Super adiabatic lapse rate

(c) Neutral lapse rate

(d) Adiabatic lapse rate

I have been asked this question in final exam.

My enquiry is from Dispersion of Air Pollutants, Contol of Gaseous Pollutants topic in chapter Air Pollution of Environmental Engineering

1 Answer

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Best answer
The correct answer is (c) Neutral lapse rate

For explanation I would say: When the temperature is constant with height, then neutral lapse rate occurs.

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