# Tropopause Definition MET

While generally we understand the tropopause as being the layer above the troposphere where temperature stops falling, the actual definition is "an area where the temperature change is not more than two-thirds of one degree Celsius per thousand foot increase in height over a range of 6000 feet."

This is almost the same as being isothermal, but not quite, and isothermal/zero lapse rate is often one of the wrong answers on the exam.

The definition needs to be recognised for the exam.