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Q&A

How do you check if a room behind a door aboard a spaceship has an atmosphere/pressure?

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How do you check if a room behind a door aboard a spaceship has an atmosphere and pressure? This is so that you would not accidentally open a door to a room which is open to space.

I imagine there would be some sort of sensor on the door. However, this would probably require electric power. What if the ship has lost its power? How would a survivor check whether the other room has an atmosphere?

Doors could have a window and there could be a cage with birds, so one might see whether the birds inside the room are alive. But this is not a very scientific way to go about this.

What would be a more modern way to do this? Maybe some sort of chemical sticker (reacting with oxygen) on the window?

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This post was sourced from https://worldbuilding.stackexchange.com/q/95630. It is licensed under CC BY-SA 3.0.

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It would be very easy to have an indicator in the window or door that raises a flag any time the pressure on one side changes. Some sort of membrane perhaps, that would move away from your room if the other room was depressurised.

I'm pretty certain something like this is used on aeroplane doors... It may be physical or electronic.

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