The lower layer in a two part classification of the atmosphere based on the general homogeneity of chemical composition. In this layer, nitrogen, oxygen, argon, carbon dioxide, and the trace gases dom [..]

The atmosphere up to 80 km (50 mi) in which the proportionality of principal gaseous constituents, such as oxygen and nitrogen, is constant.

The lower portion of a two-part division of the atmosphere according to the general homogeneity of atmospheric composition; opposed to the heterosphere. The homosphere is the region in which there is [..]

The Earth atmosphere below 105 km altitude where complete vertical mixing yields a near-homogeneous composition of about 78.1% N2, 20.9% O2, 0.9% Ar, and 0.1% CO2 and trace constituents. The homopause (or turbopause) marks the ceiling of the homosphere. The homosphere can be broadly divided into three distinct regimes: the troposphere (0 to 12 km), [..]

The atmosphere up to 80 km (50 mi) in which the proportions of principal gases, such as oxygen and nitrogen, are constant.

All the lower layers of the terrestrial atmosphere in which the scale height is the same for all the constituants: and the pressure and concentration decrease rates follow the same law for all. The homosphere ends at an altitude of about 80 kilometers.

The lower part of the atmosphere, up to about sixty miles, in which there is no great change in its composition.