How does a thermos work?

How does a thermos work?
📫𝐎𝐮𝐫 𝐅𝐁 𝐏𝐚𝐠𝐞:
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📚𝐃𝐚𝐯𝐢𝐝'𝐬 𝐁𝐨𝐨𝐤𝐬
📕 𝗪𝗲𝗶𝗿𝗱 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝗜𝗻𝗳𝗶𝗻𝗶𝘁𝘆 𝗮𝗻𝗱 𝗕𝗲𝘆𝗼𝗻𝗱
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📄𝗧𝗿𝗮𝗻𝘀𝗰𝗿𝗶𝗽𝘁𝗶𝗼𝗻:
As you know, a thermos keeps the temperature of a liquid inside it the same. If we want to make a thermos, we need prevent or minimize heat loss from the liquid. In other words, we need to minimize heat transfer from the liquid to the environment.
Heat transfer occurs in 3 main ways: convection, conduction and radiation. In convection, heat is transferred by movement of the fluid’s molecules whereas in conduction, heat flows through a body.
If we make a gap between 2 bodies and remove the air particles that can transfer heat, we can minimize heat loss by convection and conduction. So, in a thermos there are 2 bodies and there is a vacuum-containing region between the bodies. Also, in order to minimize convection, we need a stopper.
Besides these means, heat can be transferred by radiation. Thermal radiation can pass through a vacuum so a gap with a vacuum between the bodies isn’t enough. But if we silver the inner surface of the thermos (2), thermal radiation reflects back into the liquid and we eliminate heat loss by radiation.
Now we know how a thermos works.
#thermos #heat #transfer

[@gorgono1]

Thank you and very easy to understand. I have a question though, if Thermos eliminates all 3 convection, conduction and radiation then why does the drink eventually go cold after a while?

[@Imgoodnot2good]

Due to thermal equilibrium

[@crici.k]

it isn't a perfect closed system, as such would be impossible, so the thermal loss is minimised, not eliminated.

[@saijagadeesh8866]

100% is still not acheieved by human civilisation thats why

[@user-it3gp4vm1z]

It doesnt completely stop heat transfer

[@killdahoe7729]

Insulation just slows down the rate of heat transfer not stop it

[@lamer8310]

thank you, very easy to understand!

[@ViewsReactTV]

informative

[@AminulIslam-st8tv]

quality content

[@whatzitooyaa1599]

1:19 what does it mean to “silver” the inner surface?

[@apexheat6553]

To add siver ( the metal ) to the wall of the inside of the bottle

[@choco6002]

Me who just lookin at my thermos then go to yt to watch this

[@user-bs4lw6ew7e]

Yo this is yall classmate Ezekiel

[@senorsac7927]

its on sight when we get back

[@Xaeravoq]

good night