Small Pressurized Container up to 100,000ft

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Discussion Overview

The discussion revolves around the design and feasibility of a small pressurized container intended for a weather balloon experiment that would reach altitudes of up to 100,000 feet. Participants explore the implications of pressure at high altitudes, the necessity of pressurization for audio recording, and the expected sound conditions at such heights.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant inquires about building a pressurized container for a weather balloon experiment, seeking advice and experiences from others.
  • Another participant suggests that holding 1 atmosphere of pressure is manageable and mentions that a 2L pop bottle can withstand several atmospheres.
  • A participant questions the need for pressurization if the goal is to record audio at high altitudes, prompting further discussion on the nature of sound at 100,000 feet.
  • There is speculation about the audibility of sound at high altitudes, with one participant suggesting that the pressure at 100,000 feet might still allow for some sound to be heard, albeit thin.
  • Another participant emphasizes that using a pressurized container would contradict the experiment's goal of capturing sound in a near-vacuum environment.
  • One participant references a skydiver's experience at 100,000 feet, noting that they could not hear anything during their descent, which raises questions about the validity of that observation as a controlled test.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of pressurization for the audio recording experiment and the implications of sound at high altitudes. There is no consensus on whether sound would be audible at 100,000 feet or the best approach to achieve the experiment's goals.

Contextual Notes

Participants discuss the varying atmospheric pressures at high altitudes and the potential impact on sound propagation, but the discussion lacks detailed mathematical analysis or specific experimental parameters.

ricfor
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Hello, looking for any info out there on building a small pressurized container for weather balloon experiment. Only needs to withstand heights up to 100,000 ft. Anyone have any experience or advice?

Thanks
 
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ricfor said:
Hello, looking for any info out there on building a small pressurized container for weather balloon experiment. Only needs to withstand heights up to 100,000 ft. Anyone have any experience or advice?

Thanks
That's awfully broad. Pretty sure I could find a container that can hold 1 atmo of pressure with both hands closed and one eye tied behind my back.

By some accounts, a 2L pop bottle will hold several atmos.
 
Thanks Dave, we're learning...

So 1 atmosphere not too big a deal?

Tell me what you would use if you we`re going to send some cameras up there to play and record audio.
 
ricfor said:
Thanks Dave, we're learning...

So 1 atmosphere not too big a deal?

Tell me what you would use if you we`re going to send some cameras up there to play and record audio.
Why would you need to pressurize it?

Why would you need to play audio at 100,000ft?
 
Science experiment, to hear what it sounds like. Sounds like not enough vacuum at 100k ft to make it not audible?

At what height would absence of sound waves make it inaudible?
 
ricfor said:
Science experiment, to hear what it sounds like. Sounds like not enough vacuum at 100k ft to make it not audible?

At what height would absence of sound waves make it inaudible?
Ah. I wondered if that's where you were going with it.

Then you definitely don't want it in a pressurized container, do you! That would utterly defeat your experiment.
 
Doh, of course. Thanks. So you think audio will be...audible?
 
ricfor said:
Doh, of course. Thanks. So you think audio will be...audible?

Hard to say, but my money would be on yes.

A quick Google will show you the pressure at 100,000ft as a fraction of pressure at sea level.

It's low, but seems to me it would be enough, though your sound will be very thin.
 
OK, let's give it a try. I'll post results here.

Thanks for your help.
 
  • #10
Don't forget your baseline test here at sea level, so you have something to compare it to...
 
  • #11
This guy that jumped from the balloon at 100000ft said that he couldn't hear anything...and he was going something close to 700mph.
 
  • #12
Lsos said:
This guy that jumped from the balloon at 100000ft said that he couldn't hear anything...and he was going something close to 700mph.
Interesting, but not exactly a controlled test.
 

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