A Jiangsu girl fell into a 5-meter-deep river and relied on the buoyancy of her down jacket to save herself. Why is the buoyancy of her down jacket so great?

Why is the down jacket so buoyant? So what exactly is down?

Down is very fluffy and is the down that grows on the body surface of ducks and goslings. This down is soft, slender and not petal-shaped. High-grade good down is a unique natural structure that is more sophisticated than any artificial structure established after hundreds of millions of years of essence. Down is soft and multi-branched, and its thousands of down structures are interconnected, allowing enough space to store air, so down is very fluffy, and it also has the effect of conserving energy, so down is also very warm. And it makes the down jacket have great buoyancy.

So who invented the down jacket?

Speaking of the invention of down jackets, what we should think of is that in 1940, Ball first obtained the patent for down jackets in the United States. Borghi is a businessman and an activist who loves outdoor sports.

In 1920, 21-year-old Ball started his business. He rented a store of only 10 square meters in Seattle. At first, the store only sold tennis-related products. After a year of operation, Paul's business situation fell into a quiet period. At this time, he wanted to expand the store, but he did not have enough funds. So he had to think of other ways. Bauer promises to back every customer who purchases from his store with a lifetime warranty. Bauer once said that if what a customer needs is not available elsewhere, then I will make it myself. If I don’t make these products, I will lose a lot of customers.

Due to the need for funds, Ball transformed the tennis store into an outdoor product store integrating fishing, tennis, and sports. And he himself said that he would try his best to meet the needs of customers.

In January 1935, Ball went fishing with his friends for the purpose of operating the store. Despite the cold weather, they harvested a lot, and the food they hunted weighed 90 kilograms. Due to the cold weather, the thick cotton clothes hindered his movement, and he had to take off his heavy coat to facilitate the transportation of food. In the process of carrying it, he wet himself while carrying a box of fish. The exhausted Ball was gradually left behind by the team. Due to the excessive cold weather, the moisture on Ball's body gradually solidified. Fortunately, he had a revolver in his hand at this time. He fired two shots, and when the starting sound prompted his friends, they noticed that he did not follow the team. Friends heard the gunfire and came back to look for him.

No matter what, Paul will not give up his beloved outdoor activities. When he got home, he wanted to get clothes that were not so heavy and could keep him warm. Ball tried the design of down jackets many times, but never got a product that satisfied him. It suddenly occurred to him that when he was a child, Russian officers wore down jackets to keep warm in the cold. At this time, he had inspiration, and again and again After careful design, he slowly made a down jacket that satisfied him. ?B-9? This down jacket is the first down jacket of the US Air Force. It can keep warm at minus 21 degrees Celsius for three hours and float for 24 hours with a load of 11 kilograms. On the label of this down jacket, it says Eddie Bauer from West Asia, USA.