Free sample essay on Absolute instability

When the distribution of temperature is such that at every level the environmental lapse rate is greater than the dry adiabatic lapse rate, the displaced parcel of air has a tendency to continuously move upward till its temperature is equal to that of the surrounding air.


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Such a state of continued vertical movement of the ascending air is called absolute instability. When there is general instability in the atmosphere, an impulse, whatsoever, is needed to displace a given volume of air.

Intense surface heating by the sun’s rays or a physical barrier in the path of air steams is such a mechanism which initially produces the trigger-effect and forces the air to move upward.


Under the conditions of absolute instability, the displaced air mass continues its ascent till a level is reached where the temperature difference between it and the surrounding air is reduced to zero.

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