It is the layer of the Earth's atmosphere located above the troposphere and below the mesosphere. It begins at an altitude between 12.9 and 19.3 km and extends 50 km upwards.

In its lower part, the temperature remains almost invariable with the altitude, but as it rises it increases very quickly because the ozone absorbs sunlight. The stratosphere is almost completely devoid of clouds or other weather formations.

Below the stratosphere is the troposphere, from which it is separated by an area called tropopause. Above, the stratosphere ends in the stratopause.

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Steady state (theory of)Star