Editing Troposphere (section)

====Altitude====
[[File:Sky outside plane.jpg|thumb|upright=1.5|A picture of Earth's atmosphere as viewed from an [[airplane]], traveling over the [[Arctic]].]]
The temperature of the troposphere decreases with increased altitude, and the rate of decrease in air temperature is measured with the Environmental Lapse Rate (<math>-dT/dz</math>) which is the numeric difference between the temperature of the [[planetary surface]] and the temperature of the tropopause divided by the altitude. Functionally, the ELR equation assumes that the planetary atmosphere is static, that there is no mixing of the layers of air, either by [[Atmospheric convection|vertical atmospheric convection]] or winds that could create turbulence.

The difference in temperature derives from the planetary surface absorbing most of the energy from the sun, which then radiates outwards and heats the troposphere (the first layer of the atmosphere of Earth) while the radiation of surface heat to the upper atmosphere results in the cooling of that layer of the atmosphere. The ELR equation also assumes that the atmosphere is static, but heated air becomes buoyant, expands, and rises. The dry [[adiabatic]] lapse rate (DALR) accounts for the effect of the expansion of dry air as it rises in the atmosphere, and the wet adiabatic lapse rate (WALR) includes the effect of the condensation-rate of water vapor upon the environmental lapse rate.

{| class="wikitable" style="border-spacing: 5px; margin:auto;"
|+ '''Environmental Lapse Rate (ELR)'''
|-
! scope="col" style="width:150px;"| Altitude Region
! scope="col" style="width:100px;"| Lapse rate
! scope="col" style="width:100px;"| Lapse Rate
|-
! scope="col" style="width:150px;"| (m)
! scope="col" style="width:100px;"| (°C / km)
! scope="col" style="width:100px;"| (°F / 1000 ft)
|- align="center";
| &nbsp;&nbsp; &nbsp; 0.0 &nbsp; – 11,000 ||  &nbsp; 6.50 || &nbsp; 3.57
|- align="center";
| 11,000 – 20,000 ||  &nbsp; 0.0&nbsp; || &nbsp; 0.0&nbsp; &nbsp;
|- align="center";
| 20,000 – 32,000 || −1.0 ||  −0.55 
|- align="center";
| 32,000 – 47,000 || −2.8 || −1.54
|- align="center";
| 47,000 – 51,000 || &nbsp; 0.0 &nbsp; || &nbsp; 0.0 &nbsp; &nbsp;
|- align="center";
| 51,000 – 71,000 || &nbsp; 2.80 ||  &nbsp; 1.54 
|- align="center";
| 71,000 – 85,000 || &nbsp; 2.00 || &nbsp; 1.09
|-
|}