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Which state does an environmental rate between the two adiabats indicate?

  • A.Absolute stability, since the environment cools more slowly than the parcel would at every level above
  • B.Absolute instability
  • C.Neutral stratification, in which a displaced parcel experiences no restoring force at any level at all
  • D.Conditional instability

Answer: D

Conditional instability means the layer is stable to unsaturated ascent but unstable once the parcel becomes saturated, so a trigger is needed to lift the parcel to its condensation level. Most of the troposphere is in this state, which is why convection requires forcing rather than occurring spontaneously everywhere. The name captures exactly that dependence on a condition being met. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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