-1
$\begingroup$

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 field if electricity is passed through it?

Liquid shield for spacecraft?

https://astronomy.stackexchange.com/questions/30425/could-the-sun-have-liquid-iron-in-orbit

$\endgroup$
  • $\begingroup$ It is not called the Armstrong limit it is called the vapor pressure $\endgroup$ – Uwe Mar 14 at 22:58
5
$\begingroup$

The question has been evolving. I've addressed the original:

Are there any metals that has a high Armstrong limit?

I've never heard of a liquid metal that boils at 20° C or 37° C in a vacuum. Metallic hydrogen might be suggested but that's not a liquid at atmospheric pressure. So I think the answer is pretty much

All of them!

Things like mercury or gallium (>30° C) would just sit there as liquids at 2 atmospheres, 1 atmosphere, or vacuum. They have low (but non-zero) vapor pressures but they wouldn't suddenly boil. Ditto for most eutectics as well.

$\endgroup$
  • $\begingroup$ The Armstrong limit is not at 20 °C, it is at 37 °C. $\endgroup$ – Uwe Mar 14 at 23:02
  • $\begingroup$ @Uwe added, thanks. $\endgroup$ – uhoh Mar 14 at 23:03
  • 1
    $\begingroup$ @Muze "near the Sun" has nothing to do with the Armstrong limit. $\endgroup$ – uhoh Mar 14 at 23:05
  • 1
    $\begingroup$ There is a paper about the vapor pressure of mercury. See page 10 figure 1 for a graph of pressure and temperature. At 300 K the vapor pressure of mercury is less than 1 Pa, a pretty good vacuum. So liquid mercury at 37 °C will indeed boil in a vacuum (better than 1 Pascal). The dynamic of boiling depends on the heat energy transfered. $\endgroup$ – Uwe Mar 15 at 12:33
  • $\begingroup$ Yes but would the suns roche limit pull apart the ball? $\endgroup$ – Muze the good Troll. Apr 13 at 0:49

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.