The constant lair in the atmospheric law plays the role of a characteristic length. inphysics we always look for such characteristic parameters, because, although the constant temperature and thermal equilibrium assumptions are too simplistic for what is actually going on in the atmosphere, the value of lairstill gives an estimate of a height where theatmosphere undergoes a characteristic change. determine the value oflair. how does thisvalue compare with the altitude planes fly, clouds rise, and the structure of the troposphere?