Atmosphere

Based on the Greek term “atmos” = vapour and “sphaira” = ball, the word originally describes the layer of gas surrounding the terrestrial sphere.

Atmosphere means:

1. The layer of air surrounding the earth with the characteristic composition of:

  • 78 % N2
  • 21 % O2
  • 0.9 % Ar
  • 0.03 % CO2
  • Tracer gases
  • Variable proportion of water vapour 0 - 40 g water vapour per kg of air.
  • “Atmospheric pressure" means the air pressure under normal conditions on the ground. Except on high mountains, it is around 1000 hectopascal [hPa]. 1 Pascal [Pa] is 1 N/m². 

2. The atmospheres of other celestial bodies have completely different compositions and pressures.


3. “Atmosphere” is also understood to mean the gas environment of a chemical or physical process. In a closed room, it can have a completely different composition than in natural atmosphere. In pressure or vacuum chambers, the pressure of the technical atmosphere can differ from the natural atmospheric pressure by the factor of 10-15 up to several 1,000.

In low-pressure plasma, the atmosphere may consist of any type of process gases. bestehen.

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