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Which diagram plots temperature against the logarithm of pressure without skewing?

  • A.The emagram
  • B.The skew-T, whose isotherms are deliberately inclined so that the plotted sounding spreads across the page
  • C.The tephigram
  • D.The Stuve diagram, which uses pressure raised to the power kappa so that the dry adiabats become straight

Answer: A

The emagram has straight vertical isotherms and horizontal isobars logarithmically spaced, which preserves the area property while keeping the layout simple. Its disadvantage is that typical soundings occupy only a narrow diagonal band, which is exactly what the skew-T modification was introduced to correct. The name derives from energy per unit mass diagram. It remains in use across much of continental Europe. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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