Why can the hot water bottle keep warm, and what principle does the hot water bottle use to keep war

When you open the shell of the thermos, you will find that there is a very bright silver glass bottle inside, which is the bottle gall of the thermos. There are two types of pots, inner and outer tanks, which are coated with a mirror-like silver film that reflects the heat that is emitted to the outside. At the same time, there is no air between the inner and outer tanks, that is, they are in a vacuum.

A standard thermos bottle is generally 2 liters (i.e. 2000 ml).

The hot water bottle is divided into two types, the small water bottle is about two liters, and the large water bottle is about four liters. The cork of the thermos is made of cork, which is not easy to conduct heat, which prevents conduction as much as possible.

There is a vacuum in the middle of the kettle to try to prevent the occurrence of air convection; There is also a silver-white plating on the bottle of the thermos, which can reflect the heat into the bottle without radiating out.

Insulation principle:

The function of the thermos is to maintain the temperature of the hot water in the bottle, cut off the heat exchange between the inside of the bottle and the outside of the bottle, so that the "heat" in the bottle can not get out, and the "cold" outside the bottle can not come in. If you put a popsicle in a thermos, the "heat" on the outside will not easily escape into the bottle, and the popsicle will not melt easily.

Therefore, it is scientific to call a thermos flask a thermos flask, because it can keep both "hot" and "cold" in spring. The ability of a thermos to keep warm is determined by the structural characteristics of the thermos tank. It turned out that the thermos bile consisted of two thin layers of glass shell, between which air was extracted and a thin layer of silver was plated on one side of the bottle.

The thermos bile has a much thinner mouth than its "body" part, which can be corked. It is this structure that makes the thermos a thermos that is "hot in the heart and cold on the outside".

The thermos cup has the principle of heat preservation, which is common sense in life, and you can carry out my point of view.

Now the thermos cup is also a different variety, ** is different, the thermal insulation effect is also good or bad, so, what is the general material of the thermos cup? How to choose a better thermos mug? How to know what the number on the thermos cup means?

and so on, and I will answer them for you one by one.

First of all, the material of the thermos cup is generally stainless steel, glass, ceramic, plastic, purple sand, 304 or 316, and most of the materials are these. So let's introduce the thermal insulation effect of these materials and how to use them one by one. I don't know that stainless steel thermos cup is more common, and he is cheap, and the insulation effect is also very good, however, the stainless steel thermos cup is not suitable for making tea and drinks, because of overheated coffee, then he will have precipitation, there is precipitation, it will stick to the stainless steel, it is difficult to brush off.

The glass thermos cup, his thermal insulation effect is particularly good, and it is safer, and it is easy to be particularly convenient, so the thermal insulation effect and drinking water are worth recommending, but he is a little higher, the only bad thing is that he is not resistant to falling, easy to break. Ceramics we all know, ceramic thermos cup, it is more expensive, two or three times more expensive than the general thermos cup, but he is completely harmless, no toxic substances, can be used to make tea, coffee can be, and cleaning is also very convenient, cost-effective, but there are also particularly expensive ceramic thermos cups. There are generally many materials for making plastic, if the material is not good, then it is toxic, it will emit toxic substances, the thermos cup he generally has a triangular symbol, then he is qualified, but the plastic thermos cup has been used for a long time, it will have a smell, so it is not suitable for the thermos cup to buy plastic.

Purple sand is similar to ceramics, but it is more expensive, he is more expensive, and there are fewer on the market, it is mainly used to make tea. The last one is 304 and 316, which are particularly good in material, relatively high in corrosion resistance, and not easy to precipitate heavy metals.

So how to choose a better thermos cup? In addition to choosing from the material, you should also choose the bottle shape, choose its capacity, don't choose too much thermos cup, because the choice is too big and heavier, generally choose 500 to 700 ml thermos cup is the best, and the thermal insulation effect is also excellent, so choose the thermos cup according to your ** and use mode, as well as the material for the selection of the thermos cup.

The wall of the thermos bottle is double-layered, that is to say, the middle is vacuum, so it can keep warm