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Wen I Tessie is too greasy
Edit I Tessie is too tired
Preface
In the cold winter weather, the temperature all over the country is breaking through the minimum temperature day by day, people are attacked by the cold every day, but fortunately, modern science and technology are developed, at least in the indoor air conditioning, floor heating, and wood stove heating, in the indoor high temperature conditions, the cooked meal is generally not cold very fast.
But if you can drink a cup of hot water and eat a bowl of hot rice in a cold environment, your whole body will instantly become warm, but due to the low external temperature, the meals at home may be instantly cooled down as soon as they are ready, so there are many friends who do not have air conditioning at home and do not have floor heating will buy a stove at home.
When the meal is ready, turn on the stove and put the food next to the stove to keep it warm, so that when everyone goes to taste the food again, the food will not be cold.
Looking at the hot food, I can't help but think that there were not so many heating facilities in ancient times, so how did the water and food of the ancients keep warm in winter?
Ancient Water Insulation
It is said that in ancient times, large families had independent kitchens, and the kitchen would be equipped with servants to boil hot water 24 hours a day, because the ancient people did not have thermos flasks, so they could only work hard all day long to make the hot water not interrupted.
Boiling water all the time is only for wealthy families, but in ancient times, there were so many poor people who sometimes couldn't even eat hot food, how could they send someone to boil hot water in the kitchen all the time?
Legend has it that in ancient times, there was a poor family in the cold weather, invited friends to come to the house to drink tea, in order to receive friends from afar, the owner hurriedly boiled water at home to prepare to make tea, but found that there was no tea at home, so the hostess hurried to the store to sell.
However, because the shop was far away from the host's house, the man waited at home for a long time but could not wait for the hostess, but in order to let the guests always have hot water to drink, he kept burning wood and kept adding water to the kettle, and when the hostess returned, the man looked sad.
The man looked at his panting wife and said sarcastically, "Don't drink tea, everyone, a bucket of water is enough for you to take a bath," the three of them looked at each other and touched their heads in embarrassment.
In the Yuan Dynasty, a kind of thing similar to the modern thermos pot was produced, that is, a copper barrel was used, with two layers inside and outside, and boiling hot water was installed in the interlayer, and then the teapot was put in the middle of the barrel, and the principle of water vapor insulation was used to keep the hot water warm.
After a large number of modern archaeologists study the data, it is found that the development of the Qing Dynasty, the thermos bottle of the ancient people is actually a teapot barrel made of wood, the principle is actually very simple, the ancients put the teapot into the barrel, and will stuff the cotton or goose feathers with thermal insulation effect in the middle of the pot and the teapot, and the teapot spout is exposed on the outside of the teapot barrel for convenient pouring of tea.
The shape of the wooden tea barrel is not fixed, there are round, hexagonal and octagonal, like the tea barrel used by the rich and noble people is more gorgeous, the tea barrel may have gold painting and carving outside, in short, it is very elegant.
In ancient times, there were still many tools to keep food warm.
Ancient ways of keeping food warm
There are still a lot of ways to keep food warm in ancient times, as early as the pre-Qin period, "Wen Ding" has been used to keep food warm, and the use of "Wen Ding" can be placed at the bottom of the tripod to place fuel, and the way of burning and heating is used to continuously heat and keep food warm.
In the Bronze Age, the shape of "Wending" began to become diverse, with round, square, polygonal and other structures, which retained the characteristics of the Neolithic Ding in a relatively closed state.
The principle of heat preservation is still the same, there is a sandwich at the bottom of the tripod, and a charcoal fire can be placed inside the sandwich, so that the food in the tripod can be effectively kept at room temperature, although the effect of using the temperature tripod to keep the food warm is very obvious, but in the process of combustion, the fuel will contaminate the food.
Therefore, on the basis of Wen Ding, the ancients thought of a more environmentally friendly method of heat preservation, putting the food in a vessel that can hold hot water, but the hot water is separated from the food, and then using hot water to heat the food.
On the basis of the mustache, the ancients once again invented a pot with two layers of thermal insulation structure, which can still be boiled, and the professional name is copper ring, that is, hot water is placed under the copper ring, and the food that needs to be kept warm is placed on the top, and the upper and lower parts can be separated or combined.
In fact, copper rings are particularly like modern thermal insulation boxes, there is a layer of materials that can keep warm at the bottom of the thermal insulation box, and then the upper part is placed with dishes, copper rings are quite valuable kitchen utensils in the Shang and Zhou dynasties.
In 589 B.C., when the Jin, Lu, Wei and other countries jointly attacked the Qi State, the monarch of the Qi State sent a beautiful concubine to curry favor with the Jin State, and specially let her bring the copper ring, until the Eastern Han Dynasty, the copper ring was improved again, and then the steamer and steamer appeared.
The way to keep food warm indoors was indeed solved by the ancients, but when it was necessary to deliver food outside in the cold weather, a new problem was encountered, but the ancients once again made us admire their wisdom.
Outdoor thermal insulation method
The earliest invention of the insulation of food delivery is called "rice cover", which is mainly to wrap a thick layer of insulation on the outside of the container containing food, and the raw materials of the insulation layer may be cotton, quilt or straw.
In the process of using the "rice cover", people found that this tool is only suitable for short-distance transportation, if the long-distance transportation of meals, can not achieve the effect of heat preservation at all, so on this basis, the ancients invented the "thermal insulation basket" and "thermal insulation box".
The main raw material for the production of this insulation tool may be bamboo or wood, but it is generally double-layered, and cotton or grass clippings and other materials will be plugged in the middle of the interlayer, which has the effect of insulation.
Under the influence of the thermal insulation box, the ancients got inspiration from the principle of interlayer insulation, and successively designed warm bowls, warm cups, warm pots and other thermal insulation things, warm bowls are also called warm bowls, that is, the bowl has two layers of ceramic walls, and then there is a mezzanine in the middle of the two layers, which can inject hot water inward, and there is a hole at the bottom of the bowl to release water outward.
summary
In the end, the ancients have studied the insulation tools quite thoroughly, but they have not studied more advanced insulation materials, but the main insulation ideas have made great contributions to the invention of thermos pots and thermos cups for the younger generations, and provided the right ideas.