Discussion
Assertion (A): Wet bulb potential temperature identifies an air mass reliably.
Reason (R): It is conserved for both dry and saturated adiabatic motion.
Select the correct answer from the options below.
Answer: D
Because the quantity survives the ascent and descent an air mass undergoes on its journey, including any condensation and evaporation, it retains the value acquired in the source region. The reason therefore explains the assertion completely. Mixing and diabatic heating do erode the label eventually, which is why air masses gradually lose their identity far from their source.
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