How does a thermos work?
📫𝐎𝐮𝐫 𝐅𝐁 𝐏𝐚𝐠𝐞:
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📕 𝗪𝗲𝗶𝗿𝗱 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝗜𝗻𝗳𝗶𝗻𝗶𝘁𝘆 𝗮𝗻𝗱 𝗕𝗲𝘆𝗼𝗻𝗱
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📙 𝗪𝗲𝗶𝗿𝗱𝗲𝗿 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗘𝗱𝗴𝗲 𝗼𝗳 𝘁𝗵𝗲 𝗣𝗼𝘀𝘀𝗶𝗯𝗹𝗲
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📗 𝗪𝗲𝗶𝗿𝗱𝗲𝘀𝘁 𝗠𝗮𝘁𝗵𝘀: 𝗔𝘁 𝘁𝗵𝗲 𝗙𝗿𝗼𝗻𝘁𝗶𝗲𝗿𝘀 𝗼𝗳 𝗥𝗲𝗮𝘀𝗼𝗻
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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
