Mercury as a plasma at 150 Kelvin

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    Kelvin Mercury Plasma
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Discussion Overview

The discussion revolves around the theoretical concept of mercury existing as a plasma at a temperature of 150 Kelvin, particularly in the context of a proposed engine design. Participants explore the implications of pressure and temperature on the state of mercury, questioning the validity of the claims made about its plasma state at such low temperatures.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions whether pressurizing mercury to 250k atmospheres could allow it to form a plasma at 150 Kelvin, suggesting this contradicts the typical understanding of plasma formation requiring high temperatures.
  • Another participant emphasizes the need to clarify the source of the information regarding mercury plasma, implying skepticism about its validity.
  • A participant asserts that mercury would be solid at 150 Kelvin, referencing its phase diagram and noting that it would have low vapor pressure, making evaporation unlikely without significant heating.
  • Some participants argue that if mercury is at 150 Kelvin, it is likely solid, and thus cannot be a plasma unless it is super-heated, challenging the notion that pressurization could change this state.

Areas of Agreement / Disagreement

Participants generally disagree on the possibility of mercury being in a plasma state at 150 Kelvin, with some asserting it is solid and others questioning the definitions and parameters that could affect plasma formation.

Contextual Notes

There are unresolved questions regarding the definitions of plasma and the specific conditions under which mercury could transition to a plasma state, including the roles of temperature and pressure.

gary808
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TL;DR
Can you have mercury as a plasma at 150 kelvin?
I was reading up on a theoretical engine employing the following, “Mercury plasma pressurized at 250k atmospheres, at a temperature of 150 degrees kelvin (-123° C), and swirled within its accelerator to 50k RPM.”

Does pressurizing mercury so much somehow allow a plasma to form at such sub-zero temperatures?
This seems to fly in the face of what I understand should be super-heated plasma.
 
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Might help to say where you read it.
 
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Ibix said:
Might help to say where you read it.
Or maybe not, since the source was not valid. :wink:

@gary808 -- your question is "Can you have mercury as a plasma at 150 kelvin?" right? What defines a plasma? What parameters (like pressure) can affect the plasma state other than temperature?

gary808 said:
Does pressurizing mercury so much somehow allow a plasma to form at such sub-zero temperatures?
 
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berkeman said:
Or maybe not, since the source was not valid. :wink:

@gary808 -- your question is "Can you have mercury as a plasma at 150 kelvin?" right? What defines a plasma? What parameters (like pressure) can affect the plasma state other than temperature?
Yes. My point is in debunking pseudo-science. Just wanted to double-check with the experts. Pressurization isn't a factor. If it's 150 kelvin, then it is likely a solid, or else it's not 150 kelvin but a super-heated plasma instead.
 
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gary808 said:
Yes. My point is in debunking pseudo-science. Just wanted to double-check with the experts. Pressurization isn't a factor. If it's 150 kelvin, then it is likely a solid, or else it's not 150 kelvin but a super-heated plasma instead.
We don't debunk pseudoscience at PF. Thread is closed.
 

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