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The dry adiabatic lapse rate should be assumed with a mean value of…

  • A

    0.6°C / 100 m.

  • B

    1.0°C / 100 m.

  • C

    2°C / 1000 ft.

  • D

    0.65°C / 100 m.

Refer to figure.
Dry Adiabatic Lapse Rate: When dry air (unsaturated air, or air at less than 100% humidity) is forced to rise or descend, it changes temperature at a rate of 3°C per 1000 ft (1°C per 100 m).

Saturated Adiabatic Lapse Rate: When saturated air (at 100% humidity) is forced to rise or descend, it changes temperature by an average of only 1.8°C per 1000 ft (0.6°C per 100 m).

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