Timeline for How does it feel to breathe 100% oxygen at low pressure?
Current License: CC BY-SA 4.0
18 events
| when toggle format | what | by | license | comment | |
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| Oct 26, 2021 at 23:49 | comment | added | Woody | Dryness can be a problem in open breathing circuits (such as SCUBA) since gasses from compressed sources are effectively 0% relative humidity. There is no problem humidifying the gasses. Even a vacuum can be humidified. Space suits are closed circuits with CO2 scrubbers and rebreathers. The breathing gas will rapidly get humidified from exhalation and will need to be de-humidified to prevent condensation on the visor. | |
| Oct 26, 2021 at 23:42 | answer | added | Woody | timeline score: 3 | |
| Oct 26, 2021 at 22:59 | comment | added | Woody | Middle ear pressure is equalized through the Eustachian tube into the throat. The opening tends to act a bit like a one-way valve, making depressurization much easier than pressurization. The Eustachian tube passes between two small muscles which are active when swallowing or yawning, so these activities help ears ""pop". With practice, equalization gets very easy for most people. | |
| S Jul 21, 2021 at 3:08 | history | bounty ended | CommunityBot | ||
| S Jul 21, 2021 at 3:08 | history | notice removed | CommunityBot | ||
| Jul 14, 2021 at 7:12 | comment | added | CuteKItty_pleaseStopBArking | for starters, breathing oxygen at 20% pressure is dry. there is simply no way for the O2 to carry enough water vapor for longterm comfort. But breathing too dry air is a very minor discomfort, barely worth mentioning for the duration of a single EVA, or even for a couple days for capsule flight. | |
| S Jul 13, 2021 at 1:23 | history | bounty started | SE - stop firing the good guys | ||
| S Jul 13, 2021 at 1:23 | history | notice added | SE - stop firing the good guys | Draw attention | |
| Oct 6, 2020 at 14:29 | comment | added | Digger | @SF Of course, driving down a steep hill presents a pressurization, vice a depress, event... | |
| Sep 7, 2020 at 10:18 | comment | added | Uwe | @OrganicMarble Depressurization is easier for the ears than pressurization. But to avoid decompression sickness, depressurization should be slow and pressurization may be as fast as possible if there are no ear problems. | |
| Sep 6, 2020 at 18:55 | comment | added | Organic Marble | @SF In preparation for shuttle EVAs the entire crew cabin was depressurized to 10.2 psi for a lengthy pre-breathe period to flush N2 out of the EVA crew's blood. So they didn't crash down to 4 psi in one step. | |
| Sep 6, 2020 at 18:45 | comment | added | Organic Marble | Former astronaut Tom Jones gives a very detailed story on the sensations of doing an EVA in his book Skywalking. I quoted some excerpts from it in this answer about sounds during EVA space.stackexchange.com/a/44285/6944 He does not mention any effects of the lower pressure except how it made his voice sound. | |
| Sep 6, 2020 at 18:16 | comment | added | Uwe | @SF. With some experience and training as well as healthy ears pressure changes during scuba diving are no problem. You should be able to equalize your ears easily. Much more than 10 mbar difference. | |
| Sep 6, 2020 at 18:00 | history | tweeted | twitter.com/StackSpaceExp/status/1302667890861187072 | ||
| Sep 6, 2020 at 17:54 | comment | added | SF. | I also wonder how the process of depressurization feels. Stupid 10mbar when driving down a steep hill makes one's ears feel stuffed and pop. I imagine going 70 times that much can't be very comfortable. | |
| Sep 6, 2020 at 17:02 | comment | added | Uwe | Breathing at higher pressure (up to 5 bar) does not feel very different in personal experience. | |
| Sep 6, 2020 at 14:33 | review | First posts | |||
| Sep 6, 2020 at 16:21 | |||||
| Sep 6, 2020 at 14:24 | history | asked | Cory Klein | CC BY-SA 4.0 |