Intuition behind formula for thermal conductivity | Physics | Khan Academy

Intuition behind formula for thermal conductivity.

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[mailyhana]

God bless you . Man you are way better than my professor

[mrdejavu]

finally someone who can explain this clearly on youtube. thank you. this is great

[KnowledgeScroll]

This is exactly the same way I teach it to my students...I love Khan Academy

[DiDongi]

I must applaud you! Your videos are amazing! As are your explaination skills.
Keep up this fine work!

[shlokkulkarni]

He breaks them down into individual concepts and explains them intuitively...great teacher

[theophilusfabunmi]

Great was thinking about how not to forget the formula now I know how it's derived

[KrillixKai]

Thanks for this video, trying to utilize this to explain thermal conductivity to a lunar landing denier. 🙄

[BridgeWalley]

Holy c... Amazing teaching style and approach to derive an expression.
Thank you!

[shavoniilloyd]

this is actually fun i learnt something new today

[gsbutt]

very well explained, thanks for great help

[KiwiTim]

Great video on thermal conductivity. I'm a carpenter developing better performing housing construction. I think one thing that might need adding is that A (area) in the formula is relative to volume, it's hard to visualise with the schematic of a single wall. I was picturing making a wall smaller to decrease A to decrease Q/t but that only works if its positively affecting its area/volume ratio. The sphere is the perfect example, as far away as you get from sphere you get the worse the volume to area ratio becomes right? So a cube is likely the best practical and efficient shape for a building (if you're not keen on building a hexagonal prism or something that complicated haha)

[orlandoarriaga]

Just what I was looking for, perfect for my physics experiment to explain this equation

[sabnaajang]

Thanks you so much. But I really need an explanation for searles experiment of the thermal conductivity for good and poor conductors

[moodsakkad]

The only reason i was able to pass my Biophysics exam in med school is because of this channel... seriously thank u.

[nt]

For some reason I am having a problem accepting the concept that thickness of a material slows down the rate of heat transfer. If I attempt to frame the question differently then it might help.

If the area on the left was say representaive of the indoor temperature inside a building, then how much energy do I need to input into the building to keep the internal volume of the building at the desired temperature, when taking into account of the changing the variables as stated?

Strictly speaking occupants are only interested in what heat energy is being transferred into their walls (i.e. what heat is leaving their living space), and not so interested in the rate or time it takes that heat loss to travel through the fabric of the building before re-entering the atmosphere.

I can accept temperature differentials (more thermal pressure), area of transfer (more space through which energy can travel), the rate at which heat energy can move through a material (thermal resistance afforded by the material). But I am most certainly struggling to see how thickness (the distance the heat energy has to travel), has anything to do with it?

Any pointers here would be sincerely appreciated👍

[CTherm]

Great explanation of thermal conductivity. We have sensor solutions for measuring "k" and it's sometimes easy to overthink what W/mK truly means!

[amitnayak]

Sir, how specific heat different from conductivity or with other mode of heat transfer...

[UNRG-EU]

I don’t know if the thickness of the material between can influence the transfer of heat. This will catch up when the material is heated up after that the heat transfer will be equal with thin or thick material between I think.

[asmitaverma]

I think it would be silly if I ask a question after this super video.

Anyways, my question is how can anyone write so nicely with a mouse???

[jessej]

I have a question about the units..

Usually when I want to understand a term I break it down into units. It makes things intuitive for me. This was especially useful to me in fluid mechanics, thermodynamics and mechanics of materials, ect. But with this equation something feels off. The distance d is expressed in meters and is in the x-direction. The k term has meters in the denominator and is non-directional. These terms (m^2) cancel out the units from the area-- meters in the y direction and meters in the z direction. How can they cancel if they're not in the same direction?? I thought that was the point of cross products in physics- to combine terms that are the same units but are not in the same direction. I see no cross products here. What am I missing?