Questions tagged [cabin-atmosphere]

atmosphere in a spacecraft or spacesuit that an astronaut would breathe, composition, temperature, contaminants, how to generate and maintain it...

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4answers
3k views

In simple terms, how does the way space suits manage breathable gas differ from how scuba gear does it?

I say "breathable gas" because what's in the tank can be a variety of mixtures and I don't know a single word for gas mixture you can safely breathe. less scientific or clinical sounding ...
0
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1answer
94 views

How does the ISS crew adjust the color of the new LED cabin lighting? Is there a knob somewhere? Can it be programmed to change by itself?

@OrganicMarble's answer to What's the small white gadget with two black buttons in this video of the International Space Station? includes the On/Off switch for cabin lighting aboard the ISS. Is the ...
5
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0answers
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Is MOXIE's oxygen ready to breathe or is there CO2 and/or CO that would need to be scrubbed?

MOXIE splits two molecules of martian carbon dioxide into two molecules of carbon monoxide and one molecule of oxygen. Breathing elevated levels of CO2 ranges from unpleasant (to say the least and ...
3
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1answer
143 views

How did MOXIE "know" that it produced 5.4 grams of oxygen? Did it measure pressure rise in a container or just vent it? Did it use an oxygen sensor?

CNN's Perseverance rover just made oxygen on Mars is great and welcome news! While Ingenuity has been achieving one "first" on Mars Perseverance was quietly achieving yet another. After ...
19
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1answer
2k views

Astronauts make a lot of CH₄ and some H₂ as well; do space capsules and space stations have systems to remove these?

While not as much as ruminants, humans emit methane, CH4, natural gas, etc. regularly. While it is less known, we can also emit hydrogen as H2. What are the sources of molecular hydrogen in human ...
13
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2answers
352 views

Why don't astronaut helmets fog up? What's the chemistry and thermodynamics behind keeping the field of view clear even during heavy breathing?

Some space walking involves exercise (e.g. moving heavy stuff around) and the outside surface of a faceplate is constantly radiating its heat out into space. At night that thermal radiation is not ...
2
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1answer
99 views

Did NASA ethylene scrubbers "blast out submicron particles" which attack viruses and bacteria?

In this open letter addressed to the US president, Joseph Urso, CEO of ActivePure Technologies, Dallas, Texas Why Aren’t We Talking About Destroying COVID in Indoor Air? An Open Letter on How to Open ...
2
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1answer
142 views

Atmosphere inside a space capsule and need for spacesuits

Was the internal atmosphere of Mercury capsule and CSMs of Apollo missions filled with pure oxygen at low pressure, and was the ambiance controlled to match closely to that on earth (e.g. humidity, ...