What metal is the inner wall of the water bottle liner?

Daily necessities include shells made of bamboo sticks, iron sheets and plastics. Outside, the bottle is inside. The bottle liner is made of double glass. The interlayer is plated with silver and other metals on both sides, and the middle is vacuumized. The bottle mouth has a plug, which can keep the temperature in the bottle for a long time. Hot water is usually called thermos; Cold food is often called an ice bottle.

Hot Bottle: The Scientific Invention of Scottish james dewar

The concept of thermos bottle is simple: the bottle has an inner wall and an outer wall; There is a vacuum between the two walls, and there is nothing (there is not even air in it). Heat cannot be transferred through vacuum, so any liquid poured into the bottle can keep its original temperature for a long time.

This is why thermos bottles can keep warm in winter and cool down in summer. Many people who have traveled many times find it hard to imagine what it would be like without a thermos.

But the thermos bottle was not invented until 1892, although its inventor didn't realize how useful it would be at that time. The inventor was Scottish scientist james dewar.

Liquid oxygen is produced at a low temperature of MINUS 240 degrees Celsius. In order to preserve this liquid oxygen, Dewar designed a bottle, and the heat in the bottle could not be transferred in and out. The thermos we use now is evolved from this kind of "Dewar bottle". Dewar's thermos bottle is designed according to heat transfer: first, it is made of two layers of glass bottles, and the middle of the bottle is vacuumized to isolate the heat transfer from the air; Second, the bottle wall is coated with mercury, which can reflect thermal radiation back into the bottle like a mirror reflecting light; Third, the bottle mouth is covered with a cork to prevent heat from slipping out of the bottle mouth. If it is used to hold boiling water, it becomes a thermos.

However, it was the German glass manufacturer Reinhold Berg who realized that thermos bottles were useful in all kinds of situations. He obtained the patent of thermos bottle in 1903 and made a plan to put it on the market.

Berg even held a contest to name his thermos. The award-winning name he chose was "Thermos", which means heat in Greek.

Berg's products were very successful, and soon he shipped thermos bottles all over the world.

Hot water bottles are usually used for scientific purposes, for example, when the liquid needs to be kept at a constant temperature. Vaccinia, serum and other liquids are often transported in thermos bottles.

Now the thermos is not coated with mercury. Silver plating before 60' s, now magnesium oxide coating.

How to check the insulation quality of thermos?

1. Check whether the milk tip (i.e. suction nozzle) at the end of the bottle container is intact. If it is broken, it will destroy the vacuum between the interlayer of the bottle and lose the heat preservation ability.

2. Check the bottle for signs of breakage.

3. See if the bottle mouth is round. If the bottle mouth is not round, the cork cannot be sealed, which will reduce the heat preservation ability.

4. Check whether the asbestos pad shifts or falls off. Asbestos pads are three circular black spots in the middle of the bottle liner, which are supported between the inner and outer liner. If it shifts or falls off, the bottle liner will burst because it can't withstand proper water pressure.