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Which lines are straight on a skew-T diagram?

  • A.The mixing ratio lines only
  • B.Every family of lines, since the diagram is constructed so that all of the thermodynamic curves are linear
  • C.The isotherms and the isobars
  • D.The saturated adiabats, which are designed to be straight so that moist ascent may be followed easily

Answer: C

On a skew-T the isotherms run as straight lines at 45 degrees and the isobars are straight and horizontal, while the dry adiabats are gently curved and the saturated adiabats strongly so. Saturated adiabats cannot be straight on any diagram that also preserves the area property. Knowing which families are curved prevents misreading a plotted sounding.

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