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Questions tagged [oxygen]

Questions regarding consumption and production of oxygen

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Supply of liquid oxygen (LOX) maintained on the ISS? Kept cold using "space", or refrigerator?

One can transport and store oxygen more efficiently (volume and weight of tank) if it is liquid under the order of 1 atmosphere. Liquid oxygen (LOX) is kept cryogenic in insulated tanks for short ...
uhoh's user avatar
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23 votes
3 answers
7k views

Why would oxygen be stored as a super critical fluid?

Organic Marble just answered a question about Apollo 13 in terms of the storage of Oxygen, and posted some fascinating stuff, including the fact that Oxygen was stored as a super-critical fluid. I ...
Magic Octopus Urn's user avatar
14 votes
2 answers
4k views

Why is the EMU space suit pressurized to 4.3 psi specifically?

Wikipedia claims that space suits that use pure oxygen are pressurized to 4.7 psi, instead of 3.0 psi, to account for carbon dioxide and water vapor pressure as per the alveolar gas equation (although ...
Nakedible's user avatar
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20 votes
5 answers
2k views

Is atmospheric skimming for propellant feasible?

A recent comment in a discussion of satellite refueling mentioned the possiblity of a spacecraft dipping into the atmosphere from LEO to obtain oxygen. Similarly, the science fiction RPG Traveller ...
Russell Borogove's user avatar
2 votes
1 answer
354 views

Can the ISS's NORS tanks be used to recharge spacesuit or spacecraft oxygen supplies?

In this answer I said: In an emergency a pressurized tank of oxygen gas can be an immediate source of oxygen to pressurize the station, and (possibly) other thinks such as tanks for suits. But for ...
uhoh's user avatar
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22 votes
4 answers
6k views

Oxygen self-supply by plants

Plants produce oxygen, we know. This might make plants useful in the supply system of possible colonies on other planets or moons. But how efficient they are? Which is the maximum amount of oxygens ...
Zoltán Schmidt's user avatar
5 votes
1 answer
326 views

How many square meters of solar panel to power a MOXIE-like oxygen source per person?

If I wanted to live in a box on Mars to write my screenplay about living in a box on Mars, how many square meters of solar panels would I need to power a MOXIE-like CO2-to-O2 converter in order to ...
uhoh's user avatar
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4 votes
3 answers
2k views

Isn't electrolysis of water less efficient for a space craft than pressurized oxygen tanks?

Isn't electrolysis of water less efficient for a spacecraft than pressurized oxygen tanks? The ISS uses electrolysis but to do this you have to send water to space which weighs more than oxygen and ...
Aaron M's user avatar
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16 votes
2 answers
8k views

What does "stirring tanks" mean?

The Apollo 13 disaster occurred right when the "oxygen tanks were stirred". What does that mean? What benefits does it give? What would happen if they didn't stir the tanks?
Bohemian's user avatar
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15 votes
1 answer
2k views

How do they conduct electrolysis in zero gravity?

I'm building an electrolysis cell myself, and got to wondering. On Earth, there is a significant force pushing bubbles of hydrogen and oxygen upward, so your electrodes still contact mainly water. ...
BWG's user avatar
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15 votes
2 answers
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How long were the Apollo astronauts allowed to breathe 100% oxygen at 1 atmosphere continuously?

This answer explains that from the time they suited up "in the Suit Lab before launch" until the time the capsule started depressurizing during ascent, the Apollo astronauts were breathing 100% oxygen ...
uhoh's user avatar
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13 votes
2 answers
672 views

Decision Factors for using 100% $ O_2 $ cabin atmosphere in early US space program

What are the reasons for deciding to use a 100% $ O_2 $ cabin atmosphere in the early US space programme? Was danger of nitrogen narcossis a factor? Did all missions prior to Apollo 1 use a 100% $ ...
My Other Head's user avatar
8 votes
2 answers
2k views

Can a machine process and run on $CO_2$ and $H_2O$ for an $O_2$ by product?

On Mars studies have shown that carbon dioxide solidifies to dry ice at the poles. During the winter months can electrolysis be applied to collected and then contained liquid $CO_2$ to replenish ...
Muze's user avatar
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4 votes
1 answer
439 views

Did the Space Shuttle crew have to worry about monatomic oxygen?

Comments below this answer tell us that the Space Shuttle always remained in Earth's atmosphere. When it visited the Hubble Space Telescope or the ISS or Mir it was still in the thermosphere and ...
uhoh's user avatar
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4 votes
2 answers
347 views

How is it proposed to extract oxygen from lunar regolith?

Futurism's news item NASA Pumps Funding into Startup That Says It Can Harvest Oxygen From Lunar Regolith says: NASA just awarded substantial funding to Pioneer Astronautics, a company that claims it ...
uhoh's user avatar
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16 votes
2 answers
5k views

Are there any short-term survivable locations in the solar system, outside of Earth?

Are there any known natural locations (i.e. not counting ISS) in our solar system (outside of Earth) where a human being in street clothes (i.e. without a spacesuit or other specialized equipment) ...
Jeremy Friesner's user avatar
15 votes
1 answer
2k views

What is the advantage of using Helium over Nitrogen when used for pressurising LOx?

In this Twitter post of the plumbing line diagram(left half) by LauncherSpace, one can notice that Helium is used for pressurising LOx while Nitrogen is used for pressurising Kerosene. Why the ...
karthikeyan's user avatar
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14 votes
1 answer
1k views

How does it feel to breathe 100% oxygen at low pressure?

Some space suits are designed to provide an atmosphere of 100% oxygen but at a reduced air pressure about 20% that of sea level. Is breathing in such a suit uncomfortable? It seems like having such a ...
Cory Klein's user avatar
11 votes
1 answer
1k views

Function of the RL10 Oxygen Turbopump's Splined Shaft End

The oxygen turbopump in the RL10 upper stage engine has been openly discussed by NASA for some decades now, in publications like SP-8107. On page 8 of this document is a drawing of this turbopump. The ...
Rikki-Tikki-Tavi's user avatar
8 votes
2 answers
1k views

How feasible is it to grow algae on Mars to use as food, plastic and oxygen production?

I am currently researching the idea of growing spirulina algae on Mars for as a renewable source of oxygen, food and material. So the question arises: How feasible would it be to grow spirulina in an ...
Awesomepotato29's user avatar
8 votes
2 answers
3k views

Oxygen toxicity vs Apollo mission preparation

In the article on Apollo command module design, I read: The cabin atmosphere at launch was changed to 60% oxygen and 40% nitrogen at sea-level pressure: 14.7 psi (10.1 N/cm2). During ascent the cabin ...
SF.'s user avatar
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7 votes
2 answers
289 views

How much oxygen can MOXIE produce?

So MOXIE is using solid oxide electrolysis to produce Oxygen. I assume the amount of oxygen MOXIE can produce is limited so how much can it produce before the solid oxide electrolyzer cell stops ...
neubert's user avatar
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6 votes
1 answer
482 views

What effects did the different air pressure and air composition in certain spacecraft have on astronauts?

The Mercury and Gemini spacecraft, and in space the Apollo spacecraft, didn't pressurize their cockpits to 1 atm with Earth-like atmospheric composition; instead, they used pure oxygen at much lower ...
user avatar
6 votes
1 answer
697 views

How cryogenic oxygen was heated up for CM cabin repressurization?

In related question How was temperature and humidity maintained inside the Apollo mission capsules? the basic concept of conditioning Apollo mission capsules environment is described. After ...
Sergiy Lenzion's user avatar
4 votes
1 answer
1k views

How to produce oxygen out of Venusian atmosphere's carbon dioxide?

What are the possible methods of in-situ extraction of oxygen from the atmosphere of Venus, which is mostly carbon dioxide?
Keyla's user avatar
  • 53
4 votes
1 answer
190 views

Algae Bioreactor for O2 and CO2 (and food?) - Any data on required size and power requirements?

I believe that the requirements for a single persons $\require{mhchem}\ce{O2}$/$\ce{CO2}$ balance run somewhere in the region of $8m^2$ of algae, which would seem to be possible in a single $\approx ...
nirurin's user avatar
  • 459
4 votes
0 answers
132 views

Atomic oxygen and UV Radiation qualification tests for a cubesat

I'm the Assembly, Integration and Verification Engineer of a cubesat project developed by students. Currently I'm trying to create the specifications for our payloads upcoming (mon)atomic oxygen (ATOX)...
SmallSatEnthusiast1005's user avatar
4 votes
1 answer
331 views

Could the sulfuric acid in the atmosphere of Venus be heated enough by concentrated sunlight to create water and oxygen?

The atmospheric pressure and temperature at about 50 to 60 km above the surface of Venus is nearly the same as that of the Earth, making its upper atmosphere the most Earth-like area in the Solar ...
Cornelis's user avatar
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3 votes
0 answers
721 views

Safety of carbon fiber oxygen tanks

It seems that there has been controversy as to how safe carbon fiber can be for LOX tanks. In early tests, materials were found to be too ready to combust. This has been a stumbling block for ...
Johnny Robinson's user avatar
2 votes
0 answers
237 views

How much energy would be needed to liquify 1 gram of atmospheric oxygen on Mars?

I've been told I have no Moxie but I still need oxygen to live on Mars. I see that Mars' atmosphere is 0.14% oxygen and my sad moxiless self wants some. I want to make a low power refrigerator to ...
uhoh's user avatar
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2 votes
1 answer
514 views

Martian Carbon Dioxide Turbine Oxygen Generator

How much solid Carbon Dioxide can be collected in a container with the top of the container level with the ground during a Martian Winter? Side Question: What do you call a generator that runs on the ...
Muze's user avatar
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1 vote
0 answers
101 views

What fraction of the Kapton thickness on the ISS' solar panels was likely eroded throughout their lifetime? Predictions? Measurements?

Background @Tristan's answer to How are the silicon PV cells constructed in the ISS's solar panels? Are they as flexible as they appear here? informs us that Kapton is part of the "blanket" ...
uhoh's user avatar
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