# Questions tagged [thermal-conductivity]

The thermal conductivity of a material is a measure of its ability to conduct heat.

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### Source of light in a heating coil

When we connect a heater coil to an electric circuit then according to "joules law of heating effect" due to its resistance it will produce thermal energy . My question is why light is ...
1 vote
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### How best to maintain the temperature of a swim spa?

All the advice I have seen on the internet suggests that it is more economical to keep the thermostat of a hot-tub at its intended temperature, rather than turning down the thermostat when the tub is ...
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### Why do most metals have high thermal expansion coefficient although their thermal conductivity are generaly high?

the relationship between thermal conductivity and thermal expansion in metals. Why do most metals have high thermal expansion coefficient although their thermal conductivity are generaly high? Please ...
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### How to add markers to IR photographs

I'm using an IR camera to identify thermal patterns. The thermal images are similar to this [LINK] image. I'd like to add markers to the area being measured to determine dimensions and normalize the ...
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1 vote
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### EM energy flux and heat distribution in a cylindrical conductor

Consider a cylindrical conductor made of a single material (say, copper) with conductivity $\sigma$. Assume there is a current through the conductor and, to avoid complications, assume that the ...
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### Is higher or lower specific heat better for cooling an object via contact?

Suppose you want to cool an object by putting it into contact with another object, much colder object, and the transferal of joules to an intermediary equilibrium temperature is instantaneous. If this ...
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### Why don't we overheat just by existing? What is the theoretical model? [closed]

Our bodies constantly generate heat, but we don't overheat just by sitting in room temperature! Why? Something about the shape of our bodies at standard-temperature-pressure is at equilibrium with the ...
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### Does specific heat capacity depend on temperature of the substance?

A substance at 200-degree Celsius is given some amount of heat to raise its temperature by one degree Celsius and the same substance when at -200 degrees Celsius is given some amount of heat to ...
1 vote
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### What is the relation between phonon anharmonicity and thermal conductivity?

The textbook says that: if the vibration of the lattice were harmonic, then the states of phonons would be orthogonal to each other. As a result, there would be no interaction between phonons, hence ...
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### Prigogine vs. Bronsted and the minimum entropy production principle

I apologize for the length of this question. Prigogine's minimum entropy production principle fails in the simplest heat conduction case, because the temperature distribution that minimizes the ...
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1 vote
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### How to derive specific heat of a crystalline material from phonon density of states?

I have done a simulation of a crystalline material using DFT and have extracted its normal modes and its phonon density of states. Does anyone have an algorithm/code or a detailed resource that can ...
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### Thermal boundary layer of an inviscid fluid

We know that an inviscid fluid flowing along a flat plate doesn't develop a hydrodynamic boundary layer because there is no friction. we also know that viscosity is caused by intermolecular forces and ...
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### Thermal mass flow meter

I am trying to build a thermal mass flowmeter, but I am facing some challenges describing it theoretically. I have an aluminium pipe with a heating element. I am measuring the temperatures of the pipe ...
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### Doubt regarding thermal conduction in series combination

How is the rate of heat flow same in both conductors when the thermal conductivity constant is different for both conductors?I have seen this everywhere and have been confused regarding this
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### Confusion regarding effects of changing any mass in Principle of Equilibrium of Mixtures/Principle of Calorimetry

My book says that a calorimeter is made of thin copper sheets, and the thinner the better since less mass means less heat capacity, which means for the same temperature change, less heat is required ...
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### Why is cup containing coffee hot?

It happened that I was having my coffee and saw this video at the same time. It's an interview given by RP.Feynamn. In that Feynman explains about why is a cup containing coffee hot, he says that as ...
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### Speed of heat through an object

According to the Heat equation (the PDE), heat can travel infinitely fast, which doesn't seem right to me. So I was wondering, at what speed does heat actually propogate through an object? For example,...
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Suppose I have water in a beaker. I measured, its thermal conductivity by some means to be $\kappa_0$. Next, I added some salt to it so that it dissociate from it. Say, $$AB\rightarrow A^++B^-$$ Now, ...
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### In case of heat transfer in a rod, why actually steady state occurs after a time (why sections of rod cant further absorb heat)?

In heat transfer across a rod, why actually steady state occur? why temperature of sections of rod don't further increase as heat is even flowing through them and as whole rod is of same material then ...
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### Possibility of combining photovoltaics and solar thermal energy

In a private setting, photovoltaics and solar thermal energy are often harvested on the home's roof and roof area is limited. So, I thought about combining both, i.e. mounting solar collectors ...
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### Help regarding discovery question in Thermodynamics

new to the forum and I'm currently learning about "heat capacity" in my physics book, and I've had a bit of a tough time trying to see the reasoning behind a certain question. In this book, ...
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