If you like doing experiments, you may want to compare the differences between various adiabatic ways and thermos with some experiments.Or, you might want to improve the performance of the thermos.The final question is, "can you keep a cup of coffee for a whole day?" If you can answer this question positively, you can create a business empire with it...
One way to find out is to better understand your thermos:
1.Take a thermos bottle.
2.Fill it with boiling water and cover with cork.
3.Measure its temperature once every two hours with a thermometer and observe the temperature curve.
If you put the thermos in a foam insulated box, will there be any change? What would happen if you put the thermos in a hot box for a day?
The other thing you can try is to do a set of experiments to find the adiabatic values for different materials. Find a few cans that can hold the same volume of liquid as a thermos, and try to insulate them with different materials. Try things like foam, wool, aluminum foil, plastic, newspapers, etc. You can also combine them and experiment with different thickness. You can learn a lot about the thermal conductivity of different materials!
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