# Questions tagged [thermal-conductivity]

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### Tea, Heat capacity and entropy

On a Thursday morning, one of my university friends prepares for his thermodynamics exam on the following day. He has been wondering recently that entropy has the same unit as heat capacity, but ...
21 views

### Heat Generation in Watts per cubic meter - how to apply this to a volume?

Water is running through a pipe. The pipe is heated uniformly in order to heat the water running through the pipe. I want to calculate how much heat needs to be generated by the pipe in order to heat ...
32 views

### Joule Heating, Heat generating in the middle?

I work with resistance brazing and RSW on a daily basis. However there is still one thing i can't understand and its why heat seems to be generated in the middle resistance. This is a basic diagram ...
728 views

### How can plasma torches reach $28000°\text{C}$?

According to this the plasma of a plasma torch can reach up to $28000$ degrees Centigrade. How is it possible for the plasma to reach a temperature much higher than that of The Sun's surface and not ...
325 views

### Why does a salt water solution have a higher coefficient of thermal expansion (i.e. expands more) than distilled water?

I have found several different sources of data which show that a solution with a higher concentration of salt has a higher coefficient of volumetric thermal expansion than a lower concentration salt ...
20 views

### Does aluminium foil still reflect heat if covered?

If I place a foil covered sheet of board in my window to reflect heat back into the room, will closing the shutters and pulling the curtains over it render it useless ? Will foil on the other side ...
1k 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 ...
27 views

### Solid state problems (phonons conductivity)

I took a quiz where i got two answers wrong and i want to know what the correct answer is and why. Q1) In a material where both phonons and electrons contribute to the thermal conductivity, the ...