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Questions tagged [gas]

For questions about chemical substances in gaseous form, and their interactions with other elements of a world. Consider also [atmosphere].

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Can you make a star from other gases, and how long would they last?

In my Conworld, the inhabitants have discovered a type of star they cannot identify. I would like it to be a star made not from just hydrogen and helium, like our sun and countless others. But my ...
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2answers
152 views

Hot air balloons lifting bridges in volcanic areas are possible?

In this world, there is a land isolated by a lava line, and the only way to get in there, is across a bridge levitated by hot air balloons. I had the idea of making a wooden bridge being supported by ...
6
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3answers
171 views

Separating light gases from heavy without chemistry

How do steampunk civilizations get lifting gas? Inspired by the above question I was tempted to suggest collecting the gases rising from public toilets. I know that human gaseous emissions contain ...
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8answers
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What gas can I use to incapacitate pesky heroes?

Supposing I have a room currently occupied by Jedi Knights, or some other force that I can't defeat with battle droids and brute strength. I wish to incapacitate the occupants of this room with a gas, ...
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2answers
112 views

Fantastic gas, part 2: what would be the source of a subterranean gas that's not organic in origin?

Natural gas comes can be found in the underground, but its origin are the organic rests of a long time ago. However, my gas doesn't come from dead trees or anything like that. So what's an alternative ...
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1answer
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Fantastic gas, part 1: could a gas be 'polluted', 'rarified', or otherwise react negatively to electricity, excluding methane-like explosions?

I previously asked a broad enough question about designing a fictional gas but it was advised by two users to split it into smaller questions. So here I am. The main property I want this gas to have ...
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3answers
477 views

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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5answers
171 views

Chemical element made with alternative particles

In my earlier question, regarding airships, I mentioned fictional gas, as light as hydrogen but non-flammable. Is it possible to make chemical element, with atoms made not from nucleons, but with some ...
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1answer
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Could this bubble float with a person inside? [closed]

Related to this previous question: Could a city be built out of Balloons? Remember in Oz where the witch is riding in on a bubble. I began to think how could I make this as real as possible. You ...
5
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2answers
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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 ...
4
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4answers
292 views

How do you get a thick atmosphere with less than earth-like gravity?

Basically: I want a highly viscous atmosphere but I want people to be able to walk around. I was thinking earth's gravity * 0.6 or similar. I was thinking that an atmosphere of Sulfur Hexafluoride ...
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2answers
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Airborne gas capable of paralyzing or “getting high”?

Writing a science fiction where the air outside is not breathable for long periods of time. Some characters get high from the air, but large amounts of it cause the user to become paralyzed or black ...
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5answers
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Could a microbe plausibly generate lift gas for manned balloon flight?

QUESTION I was thinking about ways of justifying practical balloon flight for a pre-industrial civilization, when I remembered that some microorganisms produce methane, and better yet, hydrogen. ...
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3answers
195 views

Can this world invent gas cylinders early?

QUESTION I'd like a nation in the world I'm working on to be able to transport natural gas and hydrogen, for fuel and possibly ballooning. Natural gas pipelines and cylinders were first invented in ...
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1answer
202 views

Can liquid nuclear fuel be injected and ignited like petro from a fuel injector?

[![enter image description here][5]][5] Model Lightcraft under laser power While sadly the funding for this research has not been forthcoming, there have been proof of principle flights and open air ...
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2answers
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Viability of laughing gas as a weapon

How effective would it be? Presume that the nitrous oxide is freely available to the user (e.g. "magically" [hand-wave] produced) and that they are immune to any effects. How far would it really ...
2
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3answers
524 views

Using Solid Oxygen for a Rebreather

I'm designing an environment suit for humans to wear while interacting with a benevolent alien species while in alien space. Here's my question: How much solid oxygen (by mass and volume) it would ...
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6answers
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How do steampunk civilizations get lifting gas?

Steampunk airships typically use either helium or hydrogen as a source of lift (depending on the world). However, the source of the gas is often not fully explained, or even not mentioned at all. ...
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2answers
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What conditions would cause electricity to create carbon monoxide?

I've been mulling whether the local gaseous makeup of air is changed by electricity running along a wire. My previous question is on hold, and this one is different anyway. I couldn't find exactly ...
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2answers
85 views

Meteorology spreading problem [closed]

It is known that in WW1 "battle" gas was used for the first time. This information is used in a plethora of sci-fi stories and comics. For example it is used in Wonder Woman. What if the substances ...
8
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5answers
896 views

Is there dense, non flammable gas that I can cover the Earth in?

This question is related to Deadly, Heavier than Air Gas, and Is a world with two different types of air possible? but has several different criteria. I've also looked at https://chemistry....
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3answers
288 views

A predator that uses an airborne chemical to make prey not be afraid of it

There is a predator that lives in the forest. It is roughly the size of a large bear, and moves quite slowly - a person could outrun it at a light jog. Nor is it agile - although its arms and jaws ...
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2answers
575 views

Floating airships in planet with helium layer? [closed]

A planet's lowest atmospheric layer is breathable for humans, with approx 21% oxygen and 78% nitrogen or other stable gas. The next atmospheric layer has large amounts of helium. On this planet could ...
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9answers
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Real-life substance that causes humans to behave similar to Zombies

In my scenario, people behave after a certain "transformation" similar to Zombies. However they are not "undead", meaning that they cannot raise again after their body functions completely are out of ...
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1answer
291 views

Build a better cold trap

What I'm doing is trying to find a way to create an atmospheric cold trap that will maintain a temperature of approximately −200 degrees Celsius (−328 Fahrenheit). According to Wikipedia In ...
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2answers
208 views

Using temperature to contain an atmosphere?

So, I was looking at the temperature variations in Earth's atmosphere and noticed that it gets extremely cold in some of the upper portions. So I was wondering, could a low gravity world hold onto an ...
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1answer
219 views

A gas lighter than air allowing for easier humanoid flight

Okay, so my character is relatively short (5'6 feet). Her bones are hollow,but similiar to a birds-very dense to make up for strength. Her wingspan is 16 feet. I want her to stay as humanoid as ...
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1answer
102 views

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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4answers
247 views

Effect of impact of a pure gas comet?

I'm not even sure if gas comets can exist naturally -- feel free to comment on that in the answers. But assume that somehow a large block of frozen hydrogen/helium/oxygen/nitrogen is tumbling through ...
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2answers
145 views

Synthetic ghosts

I am fully aware a similar question exists (link below) but this is not a duplicate question and provides different parameters Are ghosts made entirely of gas possible? Differences -The subject is ...
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1answer
109 views

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 ...
0
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1answer
113 views

What symptoms would affect the crew by removing oxygen from the air? [closed]

The atmosphere on the earth is mostly nitrogen, in a sealed environment if you were to remove the oxygen from the atmosphere in 30 minutes what would the symptoms be? I think the usual trope is ...
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1answer
105 views

Could runaway methane gas emissions be an extinction level event? [closed]

Much ado has been made by a few petroleum engineers and global-warming alarmist about all of the methane gas trapped in frozen form, mostly on the ocean floors. The "What-if" scenario begins to play ...
3
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1answer
117 views

What event could cause atmospheric oxygen to slowly be replaced with hydrogen, and what would the major effects of this be?

First question What event would cause hydrogen to slowly replace oxygen in the athmosphere? it can be something natural or artifial. it doesn't have to cause too much mass extinctions. Some ...
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3answers
254 views

Atmospheric Combustion

I'm trying to devise a planet where the atmosphere can sustainably combust in certain conditions. However, this planet must be able to support human life when the atmosphere is not undergoing a ...
6
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3answers
373 views

What sort of gas is thick and does not disperse easily in an urban environment?

I am interested in writing a survival-themed interactive fiction story (a sort of "what would you do" scenario game). Obviously, the zombie apocalypse might come to mind as the setting, but this has ...
3
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2answers
303 views

Is an atmosphere with different layers possible?

I'm making a world where you live in the air, as the surface is not survivable (like Venus). I'm going to leave out the story of the planet, as it's not important. Anyway, could there be a planet ...
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3answers
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Is there any lifting gas that could provide more “lift” than hydrogen?

Or how can you modify (temperature, pressure etc.) of hydrogen or a different gas to get more "lift" in airships, if that's even possible?
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5answers
395 views

Lead-Zeppelin–Would this be possible?

Probably going to get lots of downvotes for that name... Anyway, assume that you have a zeppelin, made entirely out of lead. What gas would be required to hold this in the air? Would this contraption ...
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4answers
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What common chemical/physical reactions would, in an atmosphere composed of ~20% Oxygen and ~80% Argon, behave differently than on Earth?

Ignoring how this sort of atmosphere would come about, what are some things that happen regularly on Earth that would be altered by this sort of atmosphere? Example: Would firearms still ignite ...
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5answers
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Are ghosts made entirely of gas possible?

I'd like to create a temple haunted by beings who are ostensibly ancestral spirits - basically, ghosts. How could ghosts be explained without an afterlife? gives me some intriguing ideas, but I'd like ...
36
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17answers
12k views

Deadly, Heavier than Air Gas

In a given fantasy world, I need a deadly (yet not magical) gas that will naturally pool in low depressions and valleys. The level of magic is not high, so I'd like it to be an actual chemical that ...