Timeline for Can a gas sustain a negative pressure?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 4, 2021 at 6:00 | history | tweeted | twitter.com/StackPhysics/status/1422799482266263554 | ||
| Aug 3, 2021 at 21:10 | answer | added | GiorgioP-DoomsdayClockIsAt-90 | timeline score: 3 | |
| Aug 3, 2021 at 15:36 | comment | added | Andrew Morton | In the diagram in the question, the piston could also be held up if the chamber was filled with a gas. It is atmospheric pressure exerting a force on the outside of the piston which keeps it up. | |
| Aug 3, 2021 at 12:52 | comment | added | GiorgioP-DoomsdayClockIsAt-90 | @ChetMiller Gauge pressure is not an issue. The picture correctly depicts a situation with absolute negative pressure. The parallel with solids is also correct. However, .. there is a however. I'll try to explain with an answer. But I can't do it immediately. I'll be back to this problem in a few hours. | |
| Aug 3, 2021 at 12:42 | comment | added | Chet Miller | A liquid cannot sustain a pressure less than its equilibrium vapor pressure without forming a 2nd phase. In the picture, even though the liquid pressure may be less than atmospheric, it is still under positive absolute pressure. Thus, although the gauge pressure may be negative, the absolute pressure is positive. | |
| Aug 3, 2021 at 12:16 | comment | added | Chet Miller | @JohnRennie A gas above its critical temperature cannot condense. | |
| Aug 3, 2021 at 11:41 | comment | added | John Rennie | I suspect that gases condense to liquids precisely when the attractive forces become strong enough to make negative pressures possible. Thus gases cannot sustain a negative pressure because any gas that could immediately condenses to a liquid. But proving this is going to be tricky. | |
| Aug 3, 2021 at 11:26 | history | asked | SalahTheGoat | CC BY-SA 4.0 |