Discussion
Which unit is a potential vorticity unit equal to?
Answer: D
One potential vorticity unit is defined as \( 10^{-6} \) kelvin metres squared per kilogram per second, a combination chosen so that typical stratospheric values are a few units. Using a named unit avoids repeatedly writing an awkward combination. The other values listed are ordinary vorticities, which have units of inverse seconds rather than the combined form.
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