The polar bear has white fur, which is its protective clothing when it lives in fields of ice and snow. Research by scientists has proven that its protective clothing is a "solar heat converter", which can scare the weak. The projected light gradually accumulates then converges towards the epidermis, where it is transformed into thermal energy. Blood under the skin carries heat energy throughout the body. According to measurements, a quarter of the polar bear's thermal energy needs are provided by the polar bear. this white fur. These furs It is also a very good insulator, so the polar bear's body heat is rarely lost, so the polar bear is not afraid of the cold. Its subcutaneous fat is very thick, reaching more than 10 centimeters thick. , like wearing a big cotton-padded jacket, to resist the cold, its food is mainly composedsight of fat seals, dolphins, young whales and other animals. The polar bear eats a lot, which will naturally make it obese. better sheltered from the cold. Secondly, the soles of his feet are long and fat, and have a thick layer of dense hair, just like wearing a pair of felt shoes, so he is naturally not afraid of ice. and snow. The thick coat of long hair on its body will also help increase its ability to resist the cold. In addition, scientists have studied the thick fur of polar bears and found that their hair is not white, but colorless and transparent. This type of hair is actually hollow tubes, like quartz fibers. These hairs can be thrown into the sun's rays, causing the hair to appear white, forming an excellent protective color for polar bears. At the same time, this hair type can also transmit. radiant light diffused on the surfacethis of the skin. There, radiant light is absorbed and converted into thermal energy, so that the heat lost by polar bears in their metabolism can be replenished. efficient and can convert more than 95% of solar radiation energy into thermal energy. According to information published on scientists' websites, the United States has established scientific research stations in Antarctica since 1957. The lowest temperature recorded there was minus 80.6 degrees Celsius.
Why bears aren't afraid of the cold
Staying warm has nothing to do with color. Let's talk about his fur first. Its fur is not thick, but like a duck's free feathers, the outermost layer contains oil, which can form a windproof and waterproof layer. Even if he swims in the water, the. sea water cannot touch it. What's even more amazing is that its fur also plays a role ofinsulation and heat absorption. After studying it, scientists discovered that its hairs are like hollow tubes, just like the hollow of a thermos bottle, which can retain heat. Only ultraviolet rays can pass through these "insulating tubes", which can convert 95% of sunlight into thermal energy to supplement the metabolism of polar bears. Scientists once filled flat solar collectors with hair-like fibers and found that the efficiency of converting solar energy into heat increased by 50 percent. It's awesome ! Polar bears move relatively slowly compared to prey such as seals. They hunt primarily by sitting and waiting. The white color blends into the environment and forms an excellent "cover color", which increases the success rate of hunting. As a result, the ice in the Arctic Circle is meltingmany in summer and the success rate of hunting polar bears is greatly reduced, making them often hungry in summer. But it doesn't matter, Arctic bears are so hungry that they can go without food for a month. Source: Learning Guide for Primary School Students_Interesting Class·Lower Level
Antarctica is the coldest place on earth.
People measured the temperature here the lowest at -88.3
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Why aren't polar bears afraid of the cold?
(1) There is a thick layer of fat under its skin.
(2) The white hairs on the surface of the body are a hollow structure that can absorb solar energy to keep warm.
(3) The skin under the white body hair is black. Can maximize the use of solar energy.
(4) The body hair is very long and covered with a layer of oil and will not be soaked by cold sea water.
(5) There are thick hairs on the soles of the feet, which are both non-slip and cold-resistant.
(6) Eat plenty of high-calorie foods. Especially in winter, polar bears are very picky eaters. Feeds mainly on the fat of prey.
(7) When the Arctic enters the polar night, the period when the Arctic is coldest, it begins to hibernate.
Polar bears have white fur, which is their protective clothing when they live in fields of ice and snow. Research by scientists has proven that its protective clothing is a “solar heat converter”. It can absorb the weakest projected light, gradually accumulate it, and then collect it on the epidermis to convert it into thermal energy. The blood under the skin carries it. thermal energy to the whole body. It was determined that a quarter of the thermal energy needs of ours polar is ensured by this white fur. These furs are also good thermal insulators, so polar bears lose little body heat, so polar bears are not afraid of the cold.