Understanding Thermal Properties of Materials: A Comprehensive Guide

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Discussion Overview

The discussion revolves around the thermal properties of materials, focusing on how these properties relate to heat transfer, storage, and insulation. Participants explore various concepts such as thermal conductivity, heat capacity, and the characteristics of materials that influence their interaction with heat. The conversation is primarily conceptual, with participants seeking to understand terminology and properties relevant to material selection for specific thermal applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant requests a comprehensive guide on thermal properties, specifically how materials interact with heat, including terminology related to heat transfer and storage.
  • Another participant suggests that thermal conductivity is key to understanding a material's ability to transfer heat, noting that lower thermal conductivity indicates better heat resistance.
  • A participant introduces the concept of heat capacity as another relevant property, indicating that it also plays a role in thermal behavior.
  • One participant humorously suggests that the ideal material would be a thermal insulator with infinite melting point and stability, referencing current technologies like ultra-high-temperature ceramics and aerogels.
  • There is a claim that thermal conductivity and thermal resistivity are reciprocal, with a participant expressing skepticism about the possibility of differing parameters for heat absorption and emission.
  • Another participant mentions VIP panels as a material with high R-Value, suggesting they may be easier to work with than aerogels in certain applications.

Areas of Agreement / Disagreement

Participants generally agree on the importance of thermal conductivity and heat capacity in discussing thermal properties, but there is disagreement regarding the relationship between parameters related to heat absorption and emission. The discussion remains unresolved on the specifics of material selection and the feasibility of the ideal properties described.

Contextual Notes

Participants express various assumptions about the properties of materials without fully resolving the implications of those properties on practical applications. There are also references to specific technologies without detailed explanations of their limitations or contexts.

physior
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hello

is there a reference, wikipedia article, other article, book, or something
that will outline consisely and simply, without the maths (not necessary at this point)
the thermal properties of materials

what I mean thermal properties?
how materials interact with heat

for example, how do we say the ability of a material not to transfer/transmit heat?
how do we say the ability of a material to hold the heat inside and not giving it out to the environment?
how do we say the ability of a material to transfer heat and not keep it itself and that staying cool?
how do we say the ability of a material to be very slow in taking heat from the environment and when it takes it to keep it in it by increasing its temperature, instead of transmitting it to the environment?
some materials may also keep the heat they take in them by increasing its temperature, but may be EASY to take the heat from the environment
etc

as you can imagine, there are many parameters when dealing with heat and the environment

for example, one parameter is the easiness to get heat from the environment
other parameter is the easiness to give heat to the environment
(these two may NOT be the same)
other parameter is the capacity to store heat or not
etc

can you write here for me a comprehensive guide please, with the relevant terminology, which I am after

because I need to choose a material that:
does not take heat from the environment easily
when it does it keeps in its self
when it keeps it in itself, it can rise its temperature unlimitedly high
and it does not give it easily outthanks!
 
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Physior,

I think the majority of your concerns can be solved looking at the materials thermal conductivity. The thermal conductivity is basically a materials ability to transfer heat through conduction, or the transfer of heat through a material. You may have heard this referred to as a materials "R-Value". Here is a link to the Wikipedia page on thermal conductivity: http://en.wikipedia.org/wiki/Thermal_conductivity. To clarify, the thermal conductivity is a value which describes a materials ability to transfer heat, so the lower he thermal conductivity, the better it will resist heat transfer.

A simple example would be to think of a beer bottle vs a beer can. The thermal conductivity of the beer bottle is less than the thermal conductivity of the beer can. If you take both of them out of the cooler at the same time, and place them on a table in the sun, the heat from the exterior of the beer can will transfer through the aluminum can faster than the glass bottle. Therefore the beer in the can would become warm faster that the beer in the bottle.

I hope this helps!
 
exactly, it's not only heat conductivity, it's also heat capacity
maybe others?
 
physior said:
because I need to choose a material that:
does not take heat from the environment easily
when it does it keeps in its self
when it keeps it in itself, it can rise its temperature unlimitedly high
and it does not give it easily out

That would be a thermal insulator with an infinite melting point and infinite thermal stability.
If you find such a material NASA, among others, will be very interested.
Heat capacity has no effect on your given specifications so you don't need to worry about that.

Here's a start on where current tech. is:

http://en.wikipedia.org/wiki/Ultra-high-temperature_ceramics
http://en.wikipedia.org/wiki/Aerogel

physior said:
for example, one parameter is the easiness to get heat from the environment
other parameter is the easiness to give heat to the environment
(these two may NOT be the same)

These two are exactly the same. Thermal conductivity is the reciprocal of thermal resistivity.
I am no physicist but I don't think the universe could exist if that were not the case, or at least it would be vastly different.
 
VIP panels are also pretty neat. Very high R-Value, and can be easier to work with than aerogels depending on the application. I'm thinking of fiber suspended aerogels.
 
Billy Joule haha...brilliant name
 

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