Discussion
Which unit is conventionally used when plotting absolute vorticity charts?
Answer: C
Charts are labelled in units of \( 10^{-5} \) per second, so a typical mid-latitude absolute vorticity reads as about 10 and a strong maximum as 20 or more. Choosing a unit that makes the values order ten keeps the labels legible. Radians per second is dimensionally the same but gives inconveniently small numbers, and potential vorticity units belong to a different field entirely.
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