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Questions tagged [oxygen]

For questions about the colourless, odourless gas that is associated with life on Earth.

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What amount of forrest-fire in square km or metric tons, would be necesary to bring oxygen levels below 19.5% that humans require to stay alive? [closed]

I read that oxygen makes up 21% of the Earth's atmosphere. I'm guessing it would take a lot of burning to decrease that level, but I am not sure how to calculate that. The problem is: Roughly 400 ...
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Producing oxygen without plants

Obviously, current oxygen levels should last us years, so we are talking about a long-term solution. Also, in this hypothetical scenario, plants have stopped releasing oxygen but haven't stop ...
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Can a bin bag supply enough air to escape? [closed]

A reasonably healthy adult human is trapped in a burning building. The corridor to the outside is not on fire yet but is filled with smoke (and they can't just crawl under it). Since their eyes are ...
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How large does a human’s plastron need to be?

I’m referring to an entomological plastron which is a structure that traps a bubble of air next to the insect's body but permits contact between the air and the water. As the insect consumes oxygen ...
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Metallic oxygen as a possible future material?

I'm researching possible materials that maybe be used in the far future. I came across something called metallic oxygen. If oxygen is compressed to 10GPa, it turns into a dark red solid O8. If this is ...
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Alternative elements for oxygen transport in an alien blood

I am designing an alien civilization for a story, and I am currently in the biological part. They will be oxygen breathers, so they will need to have that oxygen delivered inside their bodies, and I ...
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1answer
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A world where underwater fire is possible [closed]

We perceive water as a fire extinguisher, based on observations related to the atmospheric conditions on our planet. However, Let's see if we can circumvent this limitation. Actually, water ...
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Can you have reduced visibility (due to fog) but an atmosphere that is still breathable?

Is it possible to have an atmosphere that is essentially fog, but still be breathable by humans? I'm basically looking to have an environment where visibility is very low (for suspense reasons) even ...
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Looking to optimize the atmospheric gas mix and pressure for humans for minimal cellular degeneration

To build another world, I would want a perfected atmosphere that would sustain the air cycle and yet optimize a decreased cellular degeneration. i.e.: increase quality and length of life. Would we ...
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How to make a human that doesn't need to breathe

I want to make a creature very similar to a human but with one major difference: they breathe like any human in their everyday life, but if they are suffocating, drowning, or there isn't O2 in the air ...
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Does oxygen have the power to heal people? [closed]

I have come to notice that oxygen is used in medicine (hyperbaric chamber) to support fast recovery of bone's fractures, wounds and even cancer. Moreover, according some studies and publications ...
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What would have to happen for the world's oxygen to decrease at an alarming rate? [duplicate]

What would have to happen for Earth's oxygen to decrease at an alarming rate and furthermore be dangerously low or completely gone in a year?
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Is it possible for the ocean to be deprived of oxygen within 1 year?

I am wondering what kind of catastrophe could contribute to affecting the average dissolved oxygen level in the ocean to become less than 1 milligram per liter and as a result making 90% of the ocean ...
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How could an earth like planet increase the amount of oxygen in the air

How could the amount (total mass) of oxygen be increased on a planet like Earth (with a similar atmospheric composition), preferably by natural processes? For the sake of having a ballpark number, ...
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Animal with inner membrane gas separation

I want to make a creature capable of filter O2 from normal air in order to make several things... (filter air toxins, increase partial pressure of O2, etc). Could be possible make an organic membrane ...
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Is possible to make an “almost-perfectly” sealed ship?

In a series I remember that a group of people were trying to make a colonization ship and they had a big problem: the air. Ships (like every object) aren't perfect and they have micro fissures in the ...
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2.5x atmospheric pressure + 25% atmospheric oxygen saturation level =? [closed]

So my question is pretty much as the title states, what would be the effects on the human body with these atmospheric conditions? More specifically, how would effect the growth of land mammals, ...
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What can I add to an oxygen/nitrogen atmosphere to make it unpalatable or poisonous to humans, yet stable and breathable to local creatures?

I have a roughly Earth-like planet in a solar system some distance from ours. The atmosphere of this planet is largely similar to that of Earth, but particularly, has a somewhat higher oxygen content; ...
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1answer
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Fire on different oxygen density

I'm creating a world with different oxygen density, about 15%. When given same fuel and air pressure, how will the fire burn up in this 15% oxygen density atmosphere compared to our world? And the ...
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Polycythemia good underground?

Polycythemia is where the hematocrit is above 55%. This can be divided into absolute and relative and absolute can be further divided into primary and secondary. Absolute polycythemia is where the ...
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What is the highest concentration of oxygen a human being can reasonably survive?

Writing a story in which a human is trapped on an alien planet with an average temp of 6 Celsius, and I want to have the atmosphere be too rich in oxygen, but not to the point where an air tank is ...
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Making the entire inner solar system have a breathable atmosphere?

Let's say it's sometime in the future, and humanity has expanded outwards into the solar system, and we've genetically engineered some really big plants that can for some unimportant reason, survive ...
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Space Farms: algae vs plants for food/oxygen?

First the reality-check: In a sci-fi world where humans have interstellar travel but "nice" Earth-like planets are rare, what reasons might an algae farm be "better" than a plant farm, especially ...
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What volcanic gases & factors, isolated in pockets/caves under an oceanic crust, could create odd ecosystems and new extremophiles? [closed]

A crack is found near the Mariana Trench that forms a long tunnel with pockets to trap bubbles/gases from deep in the lithosphere...what elements could get trapped and possibly form a new ecosystem ...
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How Do I Supplement Oxygen Intake?

Series Premise Made Short: For reasons that I'm not allowed to describe here (confidentiality), Earth's deciduous and tropical plant life largely dies off. A hardy and oxygen-hungry microbe infests ...
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1answer
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If the oxygen is introduced into the flammable gas by a tube, does it produce stable combustion? And What does the flame look like? [closed]

If the oxygen is introduced into the flammable gas by a tube, does it produce stable combustion? And What does the flame look like? And is the flame red in center or blue in periphery? And the shape ...
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Is atmospheric composition based on water content?

More specifically, I've had some debates with a friend on how a planet with low oxygen would work. Of course, it's his IP so he insisted on low oxygen, and we're hand waving aspects of it. But for my ...
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1answer
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Lowered air pressure with higher oxygen content

I know that more oxygen in the air can lead to oxygen toxicity, but what if we took a room or area and lowered the pressure in it down to about 21% and then filled it with pure oxygen? Would the low ...
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How much oxygen is too much? [duplicate]

A little while ago, I asked a question about how habitable a gas planet I created could be. Although I expected that the floating cities idea wasn't the most solid, I was surprised that one of the ...
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Oxygen - 100% plant-free!

Context for Question The colonisation of the planet [ INSERT NAME ] was an enormous social experiment performed by the Terran Planetary Science and Terraforming Council; this previously-barren world ...
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4answers
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Vanishing oxygen

So here's the premise: We have an Earth-like planet, with a civilisation at roughly the same state as ours today. Scientists have been monitoring the atmosphere for centuries, what with forecasting ...
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1answer
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could different bloods of the same metal type mix?

Other blood colors The link about talks about other color's of blood that could be if made with either different metals or different oxygen carrier's. What I want to know is if you mixed iron blood ...
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What would happen in a world with no air?

A bit of a whimsical question, or a few questions really. What would happen in a world with no air - no oxygen (plant life stop producing oxygen). Specifically, let's say the oceans shut down oxygen ...
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Is the vibrancy of the color of blood visibly affected by blood cell content?

Part of this story I'm writing involves a human subspecies who are adapted to extremely high altitudes -- as high or higher than our real world's Tibetan population, let's say. I've done research that ...
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What would happen if Earth's oxygen reached the Sun?

The Scenario: The Sun is eternal. We are producing much more oxygen than we need. First off, would the atmosphere grow, or would it just become much more dense? Given the circumstances, if the ...
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What would happen if oxygen were to briefly disappear from Earth's atmosphere, then reappear?

Imagine that the oxygen disappears from earth's atmosphere for some 10 seconds completely. what would be the casualties it would cause, what would be the climatic changes and other changes it would ...
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What properties would make a plant ideal for use on a space ship?

What properties of a species of plant would make it the ideal choice for taking it on a year-long trip through space as both an oxygen source and food source? We should assume that the amount of ...
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If we put humans on planets with atmospheres different from Earth's atmosphere, but still containing oxygen, would humans be able to breathe?

From Wikipedia: By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. For example, would humans be able to survive in ...
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What would happen if the oxygen levels decreased by 15 percent?

How would the human body be affected if the oxygen levels on Earth suddenly decreased by 15 percent? This is instant. Not over time. How would we adapt? Would some people die and some not?
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What would be the effects on the human body if the oxygen level increased by a lot?

How would the human body be affected if oxygen levels increased by a lot? Our air is 78% nitrogen and 21% oxygen. If it increased to 30% oxygen, what would the effects be and how long would it take ...