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# Long description

This figure is a graph of height (km) on the vertical axis against temperature (degrees C). The region below 11 km height is the troposphere and above it the stratosphere. The boundary at 11 km is labelled ‘isothermal height, tropopause’.

The graph itself is a straight line from 15 degrees C at the surface, sloping upwards to the left to the tropopause at 56.6 degrees C. Above the tropopause the graph is a vertical line up to 16 degrees C. The gradient of the line in the troposphere is – 6.5 degrees C per km.