<Table> Layers in the ISA Standard Atmosphere 1976 <Tr> <Th> Layer </Th> <Th> Level Name </Th> <Th> Base Geopotential Altitude above MSL h (m) </Th> <Th> Base Geometric Altitude above MSL z (m) </Th> <Th> Lapse Rate (° C / km) </Th> <Th> Base Temperature T (° C) </Th> <Th> Base Atmospheric Pressure p (Pa) </Th> <Th> Base Atmospheric Density ρ (kg / m3) </Th> </Tr> <Tr> <Td> 0 </Td> <Td> Troposphere </Td> <Td> - 610 </Td> <Td> - 611 </Td> <Td> − 6.5 </Td> <Td> + 19.0 </Td> <Td> 108,900 (1.075 bar) </Td> <Td> 1.2985 </Td> </Tr> <Tr> <Td> </Td> <Td> Tropopause </Td> <Td> 11,000 </Td> <Td> 11,019 </Td> <Td> + 0.0 </Td> <Td> − 56.5 </Td> <Td> 22,632 </Td> <Td> 0.3639 </Td> </Tr> <Tr> <Td> </Td> <Td> Stratosphere </Td> <Td> 20,000 </Td> <Td> 20,063 </Td> <Td> + 1.0 </Td> <Td> − 56.5 </Td> <Td> 5474.9 </Td> <Td> 0.0880 </Td> </Tr> <Tr> <Td> </Td> <Td> Stratosphere </Td> <Td> 32,000 </Td> <Td> 32,162 </Td> <Td> + 2.8 </Td> <Td> − 44.5 </Td> <Td> 868.02 </Td> <Td> 0.0132 </Td> </Tr> <Tr> <Td> </Td> <Td> Stratopause </Td> <Td> 47,000 </Td> <Td> 47,350 </Td> <Td> + 0.0 </Td> <Td> − 2.5 </Td> <Td> 110.91 </Td> <Td> 0.0020 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Mesosphere </Td> <Td> 51,000 </Td> <Td> 51,413 </Td> <Td> − 2.8 </Td> <Td> − 2.5 </Td> <Td> 66.939 </Td> <Td> </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Mesosphere </Td> <Td> 71,000 </Td> <Td> 71,802 </Td> <Td> − 2.0 </Td> <Td> − 58.5 </Td> <Td> 3.9564 </Td> <Td> </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Mesopause </Td> <Td> 84,852 </Td> <Td> 86,000 </Td> <Td>--</Td> <Td> − 86.28 </Td> <Td> 0.3734 </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Layer </Th> <Th> Level Name </Th> <Th> Base Geopotential Altitude above MSL h (m) </Th> <Th> Base Geometric Altitude above MSL z (m) </Th> <Th> Lapse Rate (° C / km) </Th> <Th> Base Temperature T (° C) </Th> <Th> Base Atmospheric Pressure p (Pa) </Th> <Th> Base Atmospheric Density ρ (kg / m3) </Th> </Tr> <Tr> <Td> 0 </Td> <Td> Troposphere </Td> <Td> - 610 </Td> <Td> - 611 </Td> <Td> − 6.5 </Td> <Td> + 19.0 </Td> <Td> 108,900 (1.075 bar) </Td> <Td> 1.2985 </Td> </Tr> <Tr> <Td> </Td> <Td> Tropopause </Td> <Td> 11,000 </Td> <Td> 11,019 </Td> <Td> + 0.0 </Td> <Td> − 56.5 </Td> <Td> 22,632 </Td> <Td> 0.3639 </Td> </Tr>

Average value of atmospheric pressure at sea level