Three or four thousand years ago, people would have built refrigerators ?

Humans have known about using snow to preserve food and ice to cool down as early as 3,000 years ago, and it was not until the mid-nineteenth century that refrigerators began to appear in the daily lives of American people, using refrigerators to freeze food. Subsequently, hospitals, restaurants, etc. gradually used refrigerators to keep fresh. These are all appliances that we have invented with the current state of technology, but as early as the Bronze Age, people have used "refrigerators" to freeze food to keep it fresh.

This "refrigerator" is technically supposed to be an "ice vault" and was discovered by archaeologists in the ruins of a rotunda in England. This "ice storehouse" is a site of six circles, and the overall structure is like a circular ditch, and the ditch is located on a circular roof is outside the structure. This design is able to keep things like milk and meat fresh to prevent spoilage.

Therefore, this "ice storehouse" is actually an early prototype of the cellar that came later, and the ancients built such a low cellar and used wood and other materials to make the shape of a roof and cover the cellar. And this construction is supposed to have been built around 4,000 years ago, that is, in the Bronze Age.

In subsequent archaeology, a cellar resembling a banana was found in the Iron Age, but this cellar was modified from the bronze cellar to be more practical and scientific. The appearance of the ice reservoir 4,000 years ago not only tells people about the understanding and methods of food storage in the early humans, but also shows us the super wisdom of the ancients. Since then, people have continued to improve their storage methods and utensils to meet the quality of the food they use.

Therefore, the progress of human technology can also be said to be the growth of human desires.

In fact, when people are in different eras, they will try to meet the needs of life according to the environment and their own needs at that time, so human wisdom is full of potential. However, the ancients could still live with wisdom even when there was no electricity, and now we have become lazy and more dependent after having all kinds of convenient utensils, lacking the ability to actually use the brain, if this continues to develop, then in the end will machines replace humans or human beings begin to degenerate?

Refrigerators are actually polluting, and now refrigerators are becoming more and more environmentally friendly, which I think is a good trend.

Everyone must think that the ice cubes used by ancient people in summer were stored in ice cellars in winter. In fact, this is not the case, without refrigerators and other refrigeration equipment, wouldn't ice be made? Our clever ancestors told you that there are other ways to get ice for cooling down in the summer.

Cellar ice. Ancient people used ice to cool down in the summer, but in fact, most of it did come from ice cellars.

In ancient times, the court and the government offices in the north had people who were responsible for managing the ice cellars, and Cao Cao once built an ice well platform in Yecheng, which was specially used to hide ice in winter and use it in summer.

The court of the Qing Dynasty will organize manpower to store a large number of ice cubes in winter, put them in the ice cellar, and in the summer, issue ice tickets to them, and you can receive the corresponding ice cubes to cool down at home with the tickets, which can be regarded as a kind of high temperature welfare.

In addition to the official ice cellars, there are also people who set up private ice cellars and do business from them. Ordinary people with an economic foundation will buy some ice cubes from these ice cellar owners to cool off the heat, and the richer landlords and gentry simply have their own ice cellars and store them for their own use.

Ice making. Gunpowder is one of the inventions of our country, when inventing gunpowder, the wise ancients found that saltpeter dissolved in water has the effect of cooling, so a way to make ice was produced.

Now we know that the main component of saltpeter is potassium nitrate, and the freezing point of potassium nitrate solution is lower than that of pure water. It's the same thing that is now sprinkling salt on snow to melt it.

Of course, the ancients at that time did not know this, but they knew that as long as ice and snow were mixed with saltpeter, the ice would melt automatically, and a lot of heat would be absorbed in the process of melting. If you put a bucket of liquid food in the middle of the ice at this point, the liquid food will freeze!

First of all, put the jar filled with water in a deep dish that is also filled with water, and then add saltpeter to the deep dish, saltpeter is actually calcium nitrate, which absorbs heat when dissolved in water, so in the process of continuously adding saltpeter, the water in the jar will condense into ice.

This method is generally used to make cold drinks, you read that right, the ancients also ate cold drinks. Add sugar and various spices to the water in the jar, and after the saltpeter draws the heat outside, a cold drink is ready.

It has long been known that a cold environment is the best for food preservation. But until the end of the 19th century, only wealthy people who built ice vaults could enjoy this benefit. Most people just want a refrigerated cabinet.

Jacobi Perkins, an American working in England, made a new discovery that led to the invention of the refrigerator. In 1834 he discovered that when certain liquids evaporate, there is a cooling effect. Perkins asked a group of mechanics to build a working model that would prove the idea.

Sure enough, the device did produce some ice one night. Excitedly holding the ice, the mechanics jumped into a wagon and sped to Perkins' house to show him what had been achieved. Above:

One of the most important uses of refrigerators is on ships. Large cold storage means ships can carry fresh meat over long voyages, such as lamb meat from New Zealand to Europe.

Perkins was old at this time, and he didn't have his own invention on the market. ** The inventor of the man living in Australia was a Scottish printer — John Harrison.

It is likely that Harrison discovered the cooling effect without knowing the results of Perkins. He used ether to clean the metal to print the lead lettering, and one day he noticed the cooling effect of the substance. By 1862, his first refrigerators were on the market.

Harrison also set up the first refrigeration hall at a brewery in Bendigo, Victoria.

German engineer Carl von Lind built the first household refrigerator in 1879. But before the invention of the electric refrigerator in the 20s of the 20th century, the refrigerator did not enter the home on a large scale.

The refrigerator, also known as the ice bucket, was developed from the ancient "ice jian" and has a clear function, which can not only preserve food, but also dissipate cold air to keep the room cool. It is an invention of ancient people that reveals to us a side of ancient life. Bingjian is a container for holding ice in ancient times.

Zhou Li, Tianguan, Lingren": "Sacrifice to the total (for) Bingjian." It can be seen that there were primitive refrigerators in the Zhou Dynasty at that time, but ice is not available all the time of the year, especially in the hot summer, ice can be described as precious.

Some people will ask, in ancient times, there was no electricity, was there fluorine refrigeration, where did the refrigerator come from, in fact, there is, the name is "Bingjian". Some people will ask, in ancient times, there was no electricity, was there fluorine refrigeration, where did the refrigerator come from, in fact, there is, the name is "Bingjian". 0