how does the thermos keep my tea hot for several hours?
In: 30
The thermos is double walled. This means that it’s basically a bottle within a bottle. The outer layer and the inner layer are separated and the gap is either filled with an insulating material or it’s a vacuum with no air inside. Of course the two bottles are still connected at the neck but it’s by a thin layer of material and it’s usually insulated. What this means is that while it does not completely prevent heat from escaping through conduction it severely limits it which makes the whole process a lot slower. The actual surface area of material that is in contact with the outside layer and the air is very small. The majority of the container is surrounded by a vacuum and heat can’t transfer through a vacuum, at least not through conduction or convection.
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