Heat of a solid under high pressure

In summary: Some also comes from the Earth's formation and differentiation. There may also be residual heat left over from the giant impact that formed the moon.In summary, when pressure is applied to solids, they heat up due to mechanical work being converted into heat. However, this heat dissipates once the compression process is over. The Earth's core is hot due to a combination of factors, including radioactivity, formation and differentiation, and potentially residual heat from the formation of the moon.
  • #1
dBrandon/dC
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I was wondering - when pressure is applied to solids, do they heat up? Not pressure like an impact - I'm not talking about conversion of kinetic energy. But suppose a piece of iron is put in a hydraulic press and the pressure increases slowly. More specifically, I'm wondering about the rocks deep inside the earth. Do solids generate heat simply by being under pressure? It seems like high pressure could restrict the thermal motions of the molecules, causing them to generate heat simply by their vibrations. But since solids are generally incompressible, I didn't know if this would happen. I'm posting this here because I thought the answer may be more related to Q/M than to classical physics.
 
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  • #2
When you compress a solid or any other object, you do mechanical work, which is converted to heat, raising the object's temperature. This only happens during the compression process. Afterwards if you give it a chance, the heat will dissipate and the object will cool off to the temperature of its surroundings. It does not stay hot simply by virtue of being in a compressed state.

Why is the Earth's core hot? That's a different question entirely. Some of the heat comes from radioactivity, although it's not universally agreed how much of a contribution this makes.
 

1. What is the heat of a solid under high pressure?

The heat of a solid under high pressure refers to the amount of thermal energy required to increase the temperature of a solid material while it is being compressed at a high pressure. It is a measure of the material's ability to resist changes in temperature under pressure.

2. How does the heat of a solid change under high pressure?

Under high pressure, the heat of a solid can either increase or decrease depending on the material's properties. Some solids, such as metals, exhibit an increase in heat as pressure is applied, while others, like water, experience a decrease in heat under high pressure.

3. What factors affect the heat of a solid under high pressure?

The heat of a solid under high pressure can be influenced by a variety of factors, including the material's composition, crystal structure, and temperature. Additionally, the rate at which pressure is applied and the surrounding environment can also impact the heat of a solid.

4. Why is the heat of a solid under high pressure important?

The heat of a solid under high pressure is important because it can affect the behavior and properties of materials in various applications. Understanding how a material's heat is affected by pressure can help in designing stronger and more efficient structures, as well as in developing new materials for specific uses.

5. How is the heat of a solid under high pressure measured?

The heat of a solid under high pressure can be measured using specialized equipment, such as a diamond anvil cell, which can create high pressures while allowing for temperature measurements. Other techniques, such as calorimetry, can also be used to determine the heat of a solid at different pressures.

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