Thermal Conductivity
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- čas přidán 7. 06. 2014
- 018 - Thermal Conductivity
In this video Paul Andersen explains how thermal conductivity measures the ability of material to transfer heat from a hot to a cold object. The thermal conductivity of conductors is high because the heat travels through the delocalized electrons. Heat can be transferred through insulators using phonons.
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All of the images are licensed under creative commons and public domain licensing:
Albert, Belchers. 中文（香港）: Zh:水煲電器, October 24, 2011. Own work. commons.wikimedia.org/wiki/Fil....
Cjp24. Français : Bécher En Pyrex de 50 Ml Rempli de Crème., June 24, 2012. Own work. commons.wikimedia.org/wiki/Fil....
"File:Ap Brew Hires.jpg." Wikipedia, the Free Encyclopedia. Accessed May 17, 2014. en.wikipedia.org/wiki/File:Ap_....
Hester, Darren. English: Ice Cubes, September 13, 2005. Openphoto.net. commons.wikimedia.org/wiki/Fil....
Spirit469. English: This Was Drawn to Illustrate the Subatomic Particles Present in a Portion of Plasma, with a Delocalized Electron "Sea", Very Much like the Electron "Sea" That Is Present in Conductive Metals. It Is because of This Electron Delocalization That Plasma Is Able to Conduct Electricity., January 2, 2013. Own work. commons.wikimedia.org/wiki/Fil....
Tscharntke, Titus. English:, March 1, 2013. www.public-domain-image.com/pu.... commons.wikimedia.org/wiki/Fil....
At first it was a bit fast, but I played some parts back and I think I have a nice basic understanding. Learning all this on the fly, so thank you!
Thankyou, i feel your videos help me understand physics and chemistry stuff the easist, other people use complicated terms and rarely explain what they are properly.
Wow! you are super awesome explaining science. I love the way you explained so well every single detail and your crystal clear english was a great plus. Thank you so much!
You saved me from my science teachers wrath! Thanks a bunch!
Looking like the same concept which I heard thousand times but still didn't get complete satisfactory understanding. But this video shown bby beyond comfort zone way ❤️❤️.
thanks for this videos, it's really interesting,
Thanks Man...
It really Helps a lot to understand the concept Clearly
Thermal conductivity (often denoted k, λ, or κ) is the property of a material to conduct heat. It is evaluated primarily in terms of Fourier's Law for heat conduction.
Heat transfer occurs at a lower rate across materials of low thermal conductivity than across materials of high thermal conductivity. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation. The thermal conductivity of a material may depend on temperature. The reciprocal of thermal conductivity is called thermal resistivity.
Thermal conductivity is actually a tensor, which means it is possible to have different values in different directions. See Thermal anisotropy below.
Keep up the great work!
Amazing explanation!
Yes. it was helpful :) Thank you!
Super excited it is very useful to me tq sir
I have clear my concept from this video....thnx sir
thanks for the video...
Thanks it's very helpful!
thank you very much
There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range of materials, depending on the thermal properties and the medium temperature. There is a distinction between steady-state and transient techniques.
In general, steady-state techniques are useful when the temperature of the material does not change with time. This makes the signal analysis straightforward (steady state implies constant signals). The disadvantage is that a well-engineered experimental setup is usually needed. The Divided Bar (various types) is the most common device used for consolidated rock solids.
Can you tell me the easiest way to find EC for clay brick?
Thanks bro, it was too helpful.
Just kidding sorry
so good
Thank you sir,
Hi! i dun understand the experiment part.. we can compare the rate of heat transfer using that method.. but how to calculate out the thermal conductivity of the unknown substance? can explain? THANKS!!
it is helpful
This was of great help, but u could have explained the experiment more
With the metal chair and the wooden table, the chair will feel cooler initially.
But for the same reason it feels cooler, it will also heat up faster. The wooden table will feel cool longer than the metal, to put it simply, because the heat energy from your hand is transfered at a slower (but steady) pace.
Our sensation of cold is linked with how much heat energy is lost, basically energy sucked right out of us, and ambient temperature is not always enough to decribe how cold it feel
-4 degrees Fahrenheit calm weather is heaven on earth for a Scandinavian like myself, compared to 32 degrees F with mist and a bit of wind. This is because the water in the air will drain the heat energy from you like a bad marriage, compared to the dry air you have at -4F.
A better example might be a nice 64 degrees day, just walking about the neighborhood. Warm and nice, but you'll learn alot about thermal conductivity once you jump into a 64 degrees pool.
thanks!
Mr.Andersen ... how can i determine the thermal conductivity (K) for any martial ???
how can i do this exp at home ? is there a way i can replace some equipments?
Yes!
Great though!!
too good
I would have expected to see transformer oil to have a high thermal conductivity ?
Can I use a hot plate directly on the sample?
I do not have the equipment and I want to do this test
have you done the experiment , i wanna do this , i need some help :)
What is the relationship between the Specific Heat Capacity of a material and its Thermal Conductivity?
The higher the specific heat capacity, the lower the thermal conductivity a material will possess. An every day example is water. You know that water has a high specific heat capacity because it takes a lot of energy to raise water by one degree of temperature (just think of how long it takes to boil your water). Thus, water has low thermal conductivity because it is a poor conductor and a great insulator due to its high specific heat capacity.
Water is insulator?
Thermal conductivity is a physical property right?
Yes
It is amazing that air is a poor thermal conductor (0.024 no units) and is equally a poor IR radiator - only the 1% of it ( the GHGS) radiate. That is 400ppmv CO2 and 1300part per billion(!). Yet we are told the radiated GHG air particles collide with the 99% non-GHG oxygen and nitrogen to transfer heat by convection when they can't conduct. So what gives?
When doing these experiments how do you calculate the thermal conductivity
lol 117k views yet 44 comments, fun
no wonder copper is good for frying pans.
i come here from the game Oxygen not included to understand more thermal conductivity :D