What materials heat up under pressure and for how long?

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Discussion Overview

The discussion revolves around the heating effects of pressure on various materials, specifically exploring whether certain rocks or combinations of rocks generate heat when pressed together. Participants also consider the behavior of liquids under pressure and the implications of constant pressure on temperature stability.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant inquires about the potential for certain rocks to generate heat when their flat surfaces are pressed together, questioning if high pressure leads to considerable heat generation.
  • Another participant asserts that temperature and pressure are independent, stating that high pressure does not inherently cause heat, but acknowledges that increasing pressure on a gas can raise its temperature due to mechanical work.
  • A different participant mentions that air can work well in this context but emphasizes that constant pressure alone does not produce heat, as energy requires movement (force times distance).
  • Another contribution discusses the concept of work in relation to seismic events, noting that significant heat generation occurs during 'sliding' between tectonic plates, particularly in subduction zones, where forces are large despite small distances.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between pressure and heat generation, with some asserting independence between the two while others suggest conditions under which heat may be generated. The discussion remains unresolved regarding the specific materials and conditions that may lead to heating under pressure.

Contextual Notes

There are limitations in the assumptions made about the relationship between pressure and temperature, particularly regarding the definitions of heat and work in different contexts. The discussion does not clarify the specific conditions under which materials might heat up under pressure.

tomta20012
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what materials heat up under pressure and for how long??

I was just wondering are there any two rocks or combination of rocks that when their flat surfaces are pushed together cause heat? If the pressure is very high is that heat quite considerable??

or maybe there are liquids that do the job better? are there any two materials that heat up when under pressure??

and if under a constant pressure do they stay in a constant elevated heat state?

I'm sure a physics guy here would have the abilities to find that type of material even if it was lost
 
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Temperature and pressure are independent from each other. High pressure does not cause heat. Said that, it's probably worth also mentioning the fact that increasing the pressure on a gas may cause its temperature to increase due to mechanical work - not heat - done on the gas.
 
Air works well for that.

But constant pressure will not do anything.
Energy equals Force times distance. (force applied to an object times the distance over which that object is being pushed.)
If the pressure is constant and nothing moves the distance is zero.
 
Last edited by a moderator:
Work is force times distance. With seismic events, the Distance can be very small but the Forces are huge. The heat tends to be generated most when there's 'sliding' between plates. Look up Subduction. You get a lot of volcanoes in subduction zones.
 

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