Discussion
Statement I: Thickness is proportional to layer mean virtual temperature.
Statement II: Thickness is proportional to the pressure at the base of the layer.
In the light of the above statements, choose the correct answer.
Answer: D
The hypsometric equation gives thickness as proportional to layer mean virtual temperature multiplied by the logarithm of the ratio of the bounding pressures, so the first statement is correct. The base pressure enters only through that logarithm, which is fixed once the two levels are chosen, so thickness varies with temperature alone for a given layer. That is what makes a thickness chart readable as a temperature chart.
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