Questions tagged [vacuum]

Questions regarding the effects and conditions in a 'partial vacuum' or space with a gaseous pressure significantly smaller than atmospheric pressure.

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Exit pressure value for vacuum nozzle [duplicate]

What value of exit pressure should I use in the design equations for a small liquid rocket engine nozzle for 200km-500km operating conditions? Since using zero as a value is not possible or else ...
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Ambient pressure for vaccum nozzle design

How do I find out the ambient pressure for designing a vaccum rocket engine? I am using the propellant combustion charts from the braeunig website. But I cannot figure out the ambient pressure for ...
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What is the vapor pressure limit of liquid metals in space?

Would liquid metal be stable in space unlike most other liquids like water? Are there any metals that has a high vapor pressure limit? Side question: Can liquid metal be given an electromagnetic ...
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Spacesuit needed for 1 psi 100% methane atmosphere - 60 Fahrenheit?

What sort of spacesuit would an astronaut need if she were to walk on a planet with a 1 psi (0.07 ATM) 100% methane atmosphere and -60°F (-50°C) temperatures?
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Can I freshen my clothes on the ISS with a clothes line?

There are a number of questions about washing clothes on the ISS, the short answer is that they do NOT wash them. Nudism in space: Why wear clothes anyway? Washing clothes in space: are there any ...
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What is currently known as the thinnest combination of material to hold 1 atm in space?

What is currently known as the thinnest combination of material to hold 1 atm in space? Note: must define what the composing materials are.
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Nozzle extension(skirt) attachment mechanism

I am looking for the nozzle skirt attachment mechanism, for RocketLab it looks like nuts and bolts and for SpaceX I don't have any idea. If anybody have any reference for what mechanism should be ...
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Nozzle skirt in the second stage of Rocketlab's Electron [duplicate]

As we can see, in the first stage of Rocketlab's Electron the nozzles have small nozzle exit area. Source (all) But for second stage why are they using nozzle skirt/ extension with huge exit area?
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How far/much time could an appendage extend outside of the ISS before succumbing to severe damage?

I was reading the question asked here in regards the Alexander Gerst's patching of a small (5mm) hole with his thumb temporarily. This got me wondering, if his thumb was only fine because the majority ...
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How come we don’t put a huge windmill-like machine in space? [closed]

I am new to this sight, but since space being a vacuum there is little to no air resistance at all making a windmill spin forever. There is no wind in space however, if you spin it once, it should ...
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Pool on the Moon?

Hypothetical scenario: There is a dome on the moon containing an Olympic-size swimming pool. Our intrepid hero is receiving a scuba diving lesson at the bottom of the pool (3m) when a hull breach ...
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Cooking in Space

Someone in the Worldbuilding SE asked How to Build a BBQ for the ISS. My first through was: Why not just stick it in a sealed container out in direct sunlight for a bit? It'll get plenty cooked ...
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In the absolute vacuum of Space, will an electric dynamo still work? [duplicate]

In the absolute vacuum of Space, will an electric dynamo still work? Can it produce an electric current if it is not inside (or being affected by) a magnetic field (like earth's magnetosphere)?
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What type of electrical wiring provides the longest life in space?

It sound like standard electrical wire as you would use in earth bound transportation would have a significantly shorter life in the vacuum of space. (See related Do plasticizers evaporate in space?) ...
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Do plasticizers evaporate in space?

A recent statement in an answer got me wondering. I looked and could not find an answer on space.se Polymers (think plastic cladding on wires) has "plasticizers", which make it elastic instead of ...
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Mars Vacuum-blimp Feasability

There's an article published by NASA in which they discuss the practicality of using an evacuated blimp or airship on Mars. Their main points are that since the exterior pressure is so much lower, ...
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Could there be any use with importing vacuum from space to Earth?

Space exploration pessimists say that there's nothing to import from space to Earth. So why not begin with doing exactly that?! :-) It's commonly claimed that the vacuum of space is harder (emptier) ...
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Flight Suit Pressurization

I'm curious about the pressurization of a full pressure flight suit (such as). For example, the linked suit has an operating pressure of 3.5 psi, but my assumption would be that during normal flight ...
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near space vacuum balloon

OK we know that due to air pressure a vacuum balloon would not be possible on earth. But would it be possible to create one that floated near space with almost no air pressure? If so how much ...
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How are electrical and other utilities interfaces added to an operating pressurised spacecraft?

How are extra utility lines and pipes, like data, electrical, ?or gasses and fluids, added to a manned, pressurised and operating vehicle or habitat, in space? A spacecraft may be launched with, ...
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What is the ring at the bottom of the Merlin vacuum engine?

When watching SpaceX launches, around 2-3 seconds after the Merlin Vacuum ignition a ring can be seen breaking in 2 from the bottom of the nozzle and then falling away from the second stage. My ...
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Do electronics and mechanical components work in a vacuum or require a sealed controlled atmosphere?

I'm curious about the electronics and other instruments on Voyager and similar spacecraft. Are the electronic components kept in open vacuum or in a sealed atmosphere? I imagine cooling gets tricky ...
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Why does there appear to be a 180-degree stereo microphone array outside the ISS?

I was watching a feed on the latest footage of Hurricane Matthew as seen from the ISS just now, relayed from NASA TV. Suddenly, I spotted something poking out of the ISS hull in the footage that ...
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Has any living thing been directly exposed to the vacuum of space

In our several decades of spaceflight have we ever exposed any living organism to space? I'm pretty sure this hasn't happened to Humans, but have we jettisoned some lab rats into space ("for science") ...
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What happens to a body, that has been exposed to vacuum, once brought back onboard?

You are on a ship in the cold vacuum of space. You find a body of an astronaut exposed to vacuum (for this instance just assume human, but you never know). The body was essentially freeze dried and ...
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What is the air pressure threshold for cold welding?

Cold welding is a problem in vacuum of space - where two metal parts come into contact, they may weld accidentally to each other. As I understand, even a little air or other substance prevents it. My ...
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How much efficiency is lost from a fixed De Laval nozzle when modified for atmospheric use?

Fixed nozzles designed for vacuum are larger/broader than those designed for atmospheric or combined air/space use, which have less flanged nozzles due to the drag a larger flange would incur in the ...
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Is it real to patch an opening to the vacuum with plastic tarp and duct tape as in Martian?

In the Martian movie Watney patched a broken door to the martian surface with plastic tarp and duct tape. The pressure on Mars is 0.5 kPa, which is 200 times smaller, that on Earth (100 kPa), i.e. it ...
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Could you hear the sound of your own body in the vacuum of space?

I think the answer to this question probably lies more in biology than astrophysics. If you were in space with an oxygen mask on (ignoring the fact that you will get quite cold for the moment) you ...
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What is space made of, and what is nothing? [closed]

We get told "there is nothing in space except planets etc.." (saying there is no air etc) but is there "nothing"? If there is it must be a strong vacuum and how strong will it be? could we use it for ...
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Could you “fire hose wash” a space suit on the Moon or Mars?

There are some concerns about Lunar dust attaching to the space suits during the Apollo missions. So Suitports are being developed. On Earth, cars get pretty dirty too, but a car wash solves that. ...
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What engineering processes (satellite/space vehicle related) require an atmosphere

So we all know that there are lots of engineering processes that are made 100 times better by negligible gravity, and that certain engineering process need to be performed in a vacuum (electron beam ...
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Selfies on the Moon

Number 8 on this Cracked PhotoPlasty article made me wonder - what would happen to an unprotected smartphone on the moon?
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What does the exhaust plume of a rocket look like in vacuum?

There are plenty of photos of rocket tests and launches in atmosphere, and in these the exhaust plume tends to be a long thin flame. Is this true for when rocket engines operate in a vacuum? My guess ...
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What would happen if I throw a grenade in space?

What would happen if I throw a grenade in space? Would it explode? Or will it just keep floating forever?
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Could the void of space act as a good refrigerator for food in long journeys?

Providing a theoretical journey to some far place, could the void of space be used as a good refrigerator for food since it is very cold ? Assuming that radiations in the void space are somehow ...
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Is it possible to bring “nothing” back from space?

I think the ultimate souvenir would be not a moon rock or a martian, but space "nothing", but I wonder if this is physically possible... Can an astronaut go out to space with an open container, close ...
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What are the considerations for smelting iron and aluminum in space?

Iron and aluminum are the two most common metals in the Earth's crust. While we can't know for sure what we'll find for raw resources when we start building factories in space, if we assume that iron ...
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Would unpainted iron or steel rust in space?

Iron and steel are made primarily of the same substance and they tend to rust. I believe other materials like non-ferrous metal are generally preferred for their lighter weight and strength, in most ...
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Is there any type of mechanical bearing that can be used in the full vacuum of space?

Plenty of spacecraft seem to have moving parts. Space shuttle doors open, robot arms manipulate things, etc. This is perplexing, when we consider that lubricating oil probably won't remain liquid, ...
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Has any spacecraft to date suffered catastrophic gasket degeneration in space?

A gasket is a precisely formed body of some (yielding) material placed at a mating surface usually to prevent leakage. It may also be constructed of an alloy as was done in early IC engines. ...
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Are artificial satellites completely sealed or open to space?

Are artificial satellites such as communication or weather satellites completely sealed or are they open to space? (In either case, why? How are their electronics (un)affected? Presumably they can be ...
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How do manned spacecraft achieve an airtight connection while docking?

By another question I was reminded how hard it is to build airtight equipment such as vacuum chambers from multiple pieces. Docking or berthing space ships / space station modules is a rather similar ...
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Decay of a corpse in space?

This is not nice perspective, but eventually it will happen. An astronaut falls out of spaceship because of damage caused by collision with other object, or because of suit decompression. The fluids ...