What is the best material to use for holding heat in a box?

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    Thermodynamics
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SUMMARY

The discussion centers on selecting materials for a box designed to absorb and retain heat effectively. Key concepts include specific heat and thermal capacity, defined as the product of mass and specific heat. Participants suggest that materials with higher density and specific heat values will enhance heat retention. The conversation emphasizes the importance of understanding these thermodynamic principles to make informed material choices.

PREREQUISITES
  • Understanding of specific heat and thermal capacity
  • Basic knowledge of thermodynamics
  • Familiarity with material properties such as density
  • Ability to interpret specific heat tables
NEXT STEPS
  • Research materials with high density and specific heat values for heat retention
  • Learn about thermal conductivity and its impact on heat retention
  • Investigate the use of sand and alternative materials for heat storage
  • Explore methods for heating the box effectively
USEFUL FOR

Engineers, DIY enthusiasts, and anyone involved in thermal management or heat retention projects will benefit from this discussion.

cliff terd
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ok so I am trying to make a box that will absorb heat and hold it for a long time. (cheaply) But It has been a while since my last thermodynamics discussion and I keep confusing myself. specific heat I know is the value that of heat it takes to raise temperature. But does it also tell how well that material can hold heat? or is that thermal conductivity or something else all together.

or maybe I don't need to know the theory, maybe I can just ask. If I have a box I make out of steel, what is something cheep I can put n the box to help it hold heat. I am thinking sand but it has a low specific heat so I don't know if that is the right answer. Water will not work.
 
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Welcome to PF.

I am not totally sure of your arrangement and objectives, but yes the specific heat applies. In fact, the product of mass X specific heat is more significant.

Do an internet search for specific heat table.

Again, the "thermal capacity" of your box is:

mass X specific heat = density X volume-box X specific heat.

You might tabulate materials you can use, and find the one with the highest value of density X specific heat.

Just curious, how are you heating the box?
 

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