Engineering and fabrication
How does a stainless steel thermos flask stay hot?
I was mostly just wondering, dtailed answers are appreciated. But as always, all answers are appreciated. Once I had hot water in a stainless steel thermos flask and it was still hot 2 days later, I was wondering why.
Public Comments
- There's a gap in between the two layers. It's at a vacuum so there's no conduction or convection heat transfer across the void. The only way it can get out is through radiant heat transfer and the stainless steel reflects some of that heat back in.
- it's because it's a vacuum flask, you have two stainless steel flasks welded together with only a vacuum between, a vacuum is a very poor conductor of heat so it's a very good insulator
http://home.howstuffworks.com/thermos2.htm
- The insolation around it.
- its not really the stainless steel material that cause it to stay hot. SS is used for thermos because it doesn't rust. and since it is kinda of lustrous, it reflects heat. same thing would happen if you use glass inside the thermos. its really the gap or air between the inner container and the outer cover that acts as insulation to prevent heat from escaping.
