# Questions tagged [thermal-conduction]

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### Wiedemann-Franz law

The Wiedemann-Franz law states that the ratio of thermal conductivity $\kappa$ and electrical conductivity $\sigma$ for metals fairly accurately obeys $\kappa/\sigma = LT$, where $T$ is the ...
74 views

### Why is thermal conductivity of a gas higher than one would think from diffusion coefficient

When we study kinetic theory of gases we find relationships between the processes of diffusion, heat conduction and viscosity, and collisions in the gas. In particular the diffusion coefficient is ...
1k views

### Temperature distribution in a current carrying conductor

A rod of uniform cross section and composition is connected across a battery. Let the middle part of the rod(when divided into three equal parts) is heated uniformly. A book says that the temperature ...
2k views

### Calculating new temperature of an object when air temperature changes

I'm trying to calculate the new temperature of an object when the air temperature around it changes, given a period of time. Basically I get periodic readings from an air temperature sensor in a ...
74 views

### Dimension reducing of heat equation 2D problem

I have two metal objects of different thickness and conductivity: 1) thicker, but poorly conductive. It's properties: $k_1, H$ 2) thin and much better conductive. It's properties: $k_2, h$ ...
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### Time to reach steady state in transient 1-D heat conduction

Suppose that there is a slab with thickness $2L$ and other dimensions of the slab are very bigger than $L$. Both sides of the slab are kept in the constant temperature $T_0$. In time $t=0$ a heat ...
110 views

### With what speed does a thermal front travel through a solid?

The heat equation provides theoretical temperature distributions as a function of space and time. Take for example an infinitely long rod that is suddenly heated up at $t = 0$ at its end $x = 0$. The ...
158 views

### conduction through solids

How is heat transferred through two separate bodies which are in contact. The collision of the lattices of atoms of the two bodies is a good answer but if there is a net energy transfer then shouldn't ...
38 views

### Is stoßlüften - quick exchange of air through windows actually more efficient than slow exchange through a wall ventilation fan?

In German areas with near air-tight homes, it is recommended that full house ventilation is performed by stoßlüften - opening windows fully to exchange as much air as possible in shortest amount of ...
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### In kinetic theory of gases, in finding connection between pressure and molecular kin. energy, why $N/2$ & not $N/6$ molecules are assumed to hit wall?

In my book While driving a relation between pressure and average kinetic energy of a single molecule [i.e. $P = (Nmv^2)/2$ ], an ideal gas of $N$ molecules is assumed to be enclosed in a cubical box ...
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### Heat resistance of sphere

I have been taught that the heat resistance of a hollow cylinder is R(hollow cylinder) is proportional to ln(outer radius/inner radius) It was assumed in the derivation that the inner surface is at ...
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### How can you determine how fast (m/s) heat will travel through a material being heated on one end?

I was wondering how fast heat will travel through rectangular glass bottle, heated on a tray under vacuum. I work in a lab where an inert atmosphere glovebox is used, and when moving glass bottles ...