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Questions tagged [oxygen]

Questions regarding consumption and production of oxygen

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2
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2answers
76 views

What was pressure and temperature of LM oxygen tanks?

After analysing comments in related question How cryogenic oxygen was heated up for CM cabin repressurization? It appears that LM had oxygen stored as either gas or supercritical fluid but not at ...
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1answer
581 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 ...
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0answers
44 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 ...
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3answers
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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 ...
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2answers
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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?
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What is the best oxidizer? [duplicate]

I was wondering if there is a more efficient alternative to plain o2? Also, I know this is adding another question, but could you make a functioning rocket with ozone(O3) as an oxidizer(if it is ...
3
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1answer
98 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 ...
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2answers
706 views

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 ...
3
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1answer
146 views

In principle, could the oxygen tanks of an 'air breathing' rocket, be filled during ascent?

(Thinking of SABRE and it's heat exchanger). As I understand it, Skylon would take off with full oxygen tanks. Putting aside engineering difficulties, is there a thermodynamic reason why a hybrid ...
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1answer
130 views

What would it feel like for an astronaut if his/her spacesuit ran out of air?

I’m curious what it would feel like if an astronaut’s spacesuit ran out of air while they were on mars, vs taking the suit off? inspired this question
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1answer
90 views

Conditions on Titan under which human breath can be set to fire

Motivated by the question Titan vs Mars for colonization, I wonder what exactly happens if human exhalation products are released into Titanian atmosphere and, say, a spark igniter happens to be ...
3
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1answer
237 views

How does SpaceX plan to obtain Oxygen in Mars?

In the ISS they obtain Oxygen from water through electrolysis. I guess this could be possible in Mars if they land near a large water source. NASA in the other hand, it's working for ways to obtain ...
3
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1answer
152 views

Pressurized Organic Oxygen Pods

Human waste could be used in a hydroponics facility to grow algae in space or Mars in pressurized tanks, and the photosynthesis can be used to convert CO2 to breathable oxygen. A carbon dioxide ...
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2answers
137 views

Can carbon dioxide be distilled from a Helium/Oxygen atmosphere by using natural refrigeration?

A simple air compressor compress carbon dioxide/water saturated helium/oxygen air in a tank to liquefy water from the air by pressure. Abstract the water, then refrigerate the carbon dioxide/helium/...
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0answers
43 views

Iron powder reaction in chlorate candle [closed]

When a sodium chlorate candle is ignighted, the iron powder is burned to allow the oxygen to be released with the reaction 2NaClO3 → 2NaCl + 3O2 The iron powder is not included in this equation, and ...
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261 views

What would happen if an astronaut walked on mars without a spacesuit i.e. wearing just earth clothes? [duplicate]

Which will happen first: Would she die due to lack of oxygen/suffocation or due to lack of pressure/boiling bodily fluids?
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1answer
401 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 ...
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1answer
1k 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 ...
7
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2answers
562 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 ...
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0answers
377 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 ...
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Does LOx stay as liquid when entering combustion chamber?

Given the heat from combustion and increased temperature, would the LOx still be in liquid form after emanating from the injector? Or will it instantly transform into gas? Are injectors cooled using ...
3
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2answers
176 views

Free o2 on mars?

I think that the new mars rover in 2020 will make oxygen, from thin mars air. I think Mar's atmosphere is 90% CO2. Carbon Dioxide is C + O2. O2 = Oxygen, so can't we separate carbon dioxide - oxygen? ...
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Do rockets deplete the oxygen on earth?

When we use our rockets in space, are we using up a fraction of the finite oxygen here on earth? I'm assuming that it's a negligible amount at our current rate of space travel, but could this ...
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1answer
416 views

Manufacturing H2 and O2 rocket fuel components?

I'm curious as to the typical manufacturing (or gathering) methodology of H2 and O2 used in modern rockets for fuel and oxidizer. It would seem that the most straightforward process would seem to be ...
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4answers
2k views

Is oxygen present in the sun? [closed]

If there is no oxygen in the sun, then how is it burning? My question may be weird but I need a realistic answer for that.
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2answers
394 views

Why is the surface of Mars oxidized?

Before 2.5 to 2Gya, Earth's surface was a chemically reducing environment (evidence includes reduced forms of iron, sulfur, and uranium in rocks before that time). It is believed to have become ...
2
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1answer
172 views

In-situ oxygen on Mars - what is MOXIE and SpaceX' ITS relation?

Reading through in-situ methods to manufacture oxygen on Mars, I see the following assets: in future, 100x scale of MOXIE would produce up to two kilograms of oxygen per hour https://en.wikipedia.org/...
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1answer
141 views

Balancing oxygen and food production

For a self-sustaining base on Mars (or elsewhere)... I've read and been told that growing enough plants to eat would produce too much oxygen, but there are many in-depth designs for self-sustaining ...
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5answers
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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 ...
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2answers
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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 ...
7
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1answer
153 views

Iron Oxidation Mechanism on Mars

My question relates more to the possibilities of life on Mars than to mining mineral deposits. QUESTION: Is it possible to have oxidized iron in the quantities that we see on Mars with only available ...
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1answer
184 views

Has solidifying liquid propellant been considered for space exploration?

Liquid hydrogen is $0.071 g/cm^3$ Solid hydrogen is $0.086 g/cm^3$ Since denser fuel is desirable, has solid hydrogen been considered for use in space exploration? I suspect the very low ...
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1answer
215 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 ...
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3answers
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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 ...
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2answers
545 views

Will Mars ever become breathable for humans?

There are some proposed methods like extracting oxygen from ice in polar caps getting it from the CO2 found in Mars' atmosphere or ... But let's say we finally find a feasible method to produce ...
6
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1answer
886 views

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 ...
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1answer
339 views

Could the Moon be terraformed by outgassing its oxygen?

The majority of the Moon's mass is oxygen. With energy it could chemically be liberated from its silicon et cetera compounds and be turned into oxygen gas. Given its low gravity, lack of magnetosphere ...
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1answer
400 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?
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1answer
1k 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 ...
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2answers
502 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% $ ...
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2answers
1k views

What is required to produce rocket quality methane fuel and oxygen from Mars' atmosphere?

Turning $\require{mhchem}\ce{CO2}$ and some hydrogen into $\ce{O2}$ and $\ce{CH4}$ seems pretty straightforward and has been known since early chemistry in the 19th century. But what about the quality,...
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2answers
2k 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 ...
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1answer
441 views

Does an Oxygen regeneration system as depicted in the Martian exist in real-life?

There are some resource questions posed by the book and film The Martian: How much oxygen can you take with you? How much $CO_2$ can be recycled back into oxygen? How much energy would you need for ...
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1answer
1k 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. ...
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1answer
267 views

Is the Hybrid sulfur cycle a good way of making hydrogen and oxygen on Venus?

Assuming we collect Sulfuric acid from Venus clouds using some sort of airship, what would be the best way of turning this into hydrogen and oxygen? I came across something called the Hybrid sulfur ...
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1answer
125 views

Can machines which manufacture oxygen using co2 conversion be created on Mars?

It appears that the best way to produce oxygen on Mars is using reverse fuel cells to extract oxygen from the co2 in the atmosphere. However any machine we sent there would eventually wear out. Does ...
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2answers
300 views

Where can I breathe for free? [closed]

There ain't no such thing as a free lunch was often a plot point in the works of Robert Heinlein, particularly in regards to air. We know that Air in International Space Station comes at price, in ...
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1answer
2k views

What are the odds of finding a lifeless planet with breathable air?

As I understand it, our current breathable atmosphere on Earth is the result of early lifeforms transforming huge amounts of CO2 into O2. Before early life, even Earth's atmosphere wasn't livable for ...
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1answer
980 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 ...
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5answers
2k views

What level of oxygen in a planetary atmosphere would be indicative of life?

Astronomical spectroscopy can be used to determine the chemical composition of far away bodies. In the related question Can we detect atmosphere on exoplanets? we learned that even now we are studying ...