Why polar bears can adapt to the cold Arctic weather

Polar bears can adapt to cold climates mainly due to their fur. Let’s talk about its fur first. Its fur is not thick, but like the free feathers of a duck, the outermost layer has oil, which can form a windproof and water-proof layer. It is not afraid of wind and water. Even if it swims in the water, the sea water cannot touch it. skin. What's even more amazing is that its fur also plays a role in insulation and heat absorption. After studying it, scientists found that its hairs are like hollow tubes, just like the hollow of a thermos bottle, which can keep heat. Only ultraviolet rays can pass through these "insulation tubes", which can convert 95% of sunlight into heat energy to supplement polar bear metabolism. Scientists once filled flat-panel solar collectors with hair-like fibers and found that the efficiency of converting solar energy into heat increased by 50%. That's amazing! Next, let’s talk about its skin. The skin under its fur is black, close to the color of its exposed nose and bear paws. Among visible light in nature, black absorbs heat best. Although the sunlight in the Arctic is relatively weak, thanks to their dark skin, polar bears can absorb the sunlight to the maximum extent and use it for their own use. It is the "genuine leather" composed of fur, skin and fat that polar bears can withstand the severe cold of the Arctic. How cold can this leather resist? There have been records of temperatures dropping to minus 80°C in the Arctic, but polar bears have still survived, which shows that minus 80°C is no problem. As for the maximum temperature, the tolerance of polar bears, whose skin does not sweat like dogs, is not as good as that of humans. According to records, it only needs to be 25.

If you stay in the space for a while, the cute fat white guy will go crazy! Source: Study Guide for Primary School Students_Fun Class·Lower Grades