Mathematical Definition
In general, a lapse rate is the negative of the rate of temperature change with altitude change, thus:
where is the lapse rate given in units of temperature divided by units of altitude, T = temperature, and z = altitude.
Note: In some cases, or can be used to represent the adiabatic lapse rate in order to avoid confusion with other terms symbolized by, such as the specific heat ratio or the psychrometric constant.
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