Birdwatch Note Rating
2023-12-31 02:39:32 UTC - HELPFUL
Rated by Participant: 2818A4E554D0BA4E73AF0CA7DA42EEBF5494F85483BC7354990E54A70E0AEC74
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Original Note:
SCUBA divers like the one pictured use open-circuit systems, where the breathing gas is directly vented to the environment after being exhaled. https://en.wikipedia.org/wiki/Scuba_set#Open_circuit These systems are much less efficient than the closed-circuit systems used by astronauts. https://en.wikipedia.org/wiki/Apollo/Skylab_spacesuit#Portable_Life_Support_System
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