Discussion
Which rotation is applied to the tephigram in practice?
Answer: C
Rotating the diagram places the isobars almost horizontally and the dry adiabats at about forty five degrees, which produces the familiar appearance of a plotted ascent. Without the rotation the sounding would run diagonally across the page and be much harder to read. The rotation changes nothing about the thermodynamics, since areas are preserved under rotation, and it is purely a matter of presentation. The isotherms then run diagonally upward to the right, which is the feature that distinguishes a tephigram at a glance.
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