What is an "isothermal layer"?
If the temperature remains constant with height, such as at the tropopause, it is referred to as an isotherm or an isothermal layer. In an isothermal layer, the environmental lapse rate is 0°C per 1000 ft.
When the temperature increases with height, this phenomenon is known as an inversion.
Isotherms and inversions in the troposphere typically occur within a relatively well-defined layer.
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