Establishing Stability MET

The stability is established by comparing the environmental lapse rate (the actual fall of temperature with height) to two standard rates: the DALRDALR —Dry Adiabatic Lapse Rate of 3 degrees per 1000' and the SALRSALR —Saturated Adiabatic Lapse Rate of 1.8 degrees per 1000'. If the lapse rate is greater than 3, the layer is absolutely unstable. If it is between 1.8 and 3, it is conditionally unstable (note there is no such term as conditionally stable.) If it is less than 1.8 (including 0 or negative) the layer is absolutely stable.

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From which piece of information is the stability of a layer of the atmosphere found?
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