Specific structure of insulation cup

In real life, the utilization rate of heat preservation cup is quite high. Now let's understand the specific structure of heat preservation cup. Generally, it is a container containing water made of ceramic or stainless steel and vacuum layer, with a cover on the top and tight sealing. The vacuum insulation layer can delay the heat dissipation of water and other liquids contained inside, so as to achieve the purpose of heat preservation. The thermos is developed from the thermos. The thermos principle is the same as the thermos, but people make the thermos into a cup for convenience. There are three ways of heat transmission: radiation, convection and transfer.
The silver cup liner in the thermos can reflect the radiation of hot water, the vacuum of the cup liner and the body can block the heat transfer, and the bottle that is not easy to transfer heat can prevent the heat convection. The current thermos also applies the principle of magnetizing water, which is to add magnets to the bottom and cap of the thermos to magnetize the water.
It is said that magnetized water has magical effects. The wall of the thermos bottle (or thermos cup) is made of double-layer glass, and the middle of the double-layer glass is vacuum (vacuum does not conduct heat, that is, if the hot water is isolated from the outside through vacuum, the hot water is not easy to become cold, and the purpose of heat preservation is achieved). Moreover, its cover is generally made of the thermos cup with poor thermal conductivity (such as wood block, hollow plastic, etc.), and the middle of the thermos cup is a double-layer glass bottle liner. The vacuum state is formed between the two layers, and silver or aluminum plating is used。