Discussion
Assertion (A): The thermal wind is a wind that can be measured by an anemometer.
Reason (R): The thermal wind is the vector difference between geostrophic winds at two pressure levels.
Select the correct answer from the options below.
Answer: A
The reason gives the correct definition, and that definition is exactly why the assertion fails: a difference between two winds is a shear rather than a flow, and nothing moves with it. The misleading name is responsible for a great deal of confusion. Recognising that the quantity has the units of a wind without being one is the key step in using the relation confidently.
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