This is the 10918th most frequent German word.
sauerstoff
Oxygen.
Here, 'Sauerstoff' is used as a subject noun representing the chemical element oxygen.
Sauerstoff ist essentiell für das Überleben der meisten Lebewesen.
Oxygen is essential for the survival of most living beings.
In this usage, 'Sauerstoff' denotes a resource being carried and specifically refers to the content of diving tanks.
Die Taucher haben zusätzlichen Sauerstoff in ihren Tanks mitgebracht.
The divers brought extra oxygen in their tanks.
Here, 'Sauerstoff' is part of the compound word 'Sauerstoffgehalt', indicating the concentration or level of oxygen in a given context.