The picture illustrates the components of a thermos flask which is able to maintain the water's temperature in several hours. Clearly, what stands out from the graph shows while it looks small and simple, the design of this flask is fairly complicated. However, it has an essential function to keep water still warm.
In general, the thermos flask is arranged in two layers, both in its body and lid. First, the inner part, consisting of a silvered glass envelope having less infrared radiation and being a poor conductor, is the vacuum flask. Next, the outer one, is a case made of metal or plastic materials. The main element of this, the insulated support, is positioned in the bottom between the vacuum flask and outer case. It has the possibility to keep hot liquids on the inside of the bottle still warm within some hours.
Moving to a more detailed analysis, the picture reveals the thermos bottle is formed from cap and cup, composed of plastic. By opening the cup, people can consume the water. Not surprisingly, some heat can be lost in this step. Finally, this complicated thermos flask's design, is only about 30-40cm tall.