Who can talk about some interesting or magical physical phenomena?

Science is closely related to life, and many magical phenomena in life can be explained by physical knowledge.

(1) clothing color

As we all know, sunlight is a mixture of red, orange, yellow, green, blue, indigo and purple. Different objects have different absorption and reflection abilities for different colors of light. People can't see the light absorbed by objects, only the reflected light. Therefore, what color light an object can reflect, in our view, it has what color. Such as safflower, because it can only reflect red light and absorb light of other colors; White things can reflect all colors of light, so they look white; But black things can absorb all colors of light, and there is no light reflected back, so they look black.

The sun not only brings people light, but also brings a lot of radiant heat. For radiant heat, black only absorbs and does not reflect, while white is just the opposite.

Generally speaking, dark things absorb more sunlight and radiant heat and reflect less; Light-colored things reflect more and absorb less. Therefore, people like to wear light-colored clothes in summer, such as white, gray, light blue and light yellow, which can reflect a lot of light and radiant heat and make people feel cool. It is best to wear black and dark blue clothes in winter. They can absorb a lot of light and radiant heat, and people naturally feel warm.

When people know the laws of nature, they can use them in production technology. For example, the surfaces of large open-air gas tanks and oil tanks are painted silvery white to improve their ability to reflect sunlight and radiate heat, so that the temperature of the tanks will not rise too high, so as not to cause explosion accidents.

People also use the principles of reverse and absorption to conquer nature and make it serve mankind. There is a Qilian Mountain in the northwest of China, which is covered with snow and ice. However, because the mountains are very high and the weather is very cold, even in hot summer, strong sunlight and radiant heat are reflected back by dazzling white snow and ice, so the snow can't melt. As a result, the vast fields under the mountain were barren because of lack of water. After liberation, the party led the people to March into nature. In order to make the Qilian Mountain pay water, the government sent a task force to spread carbon black on the snow in Qilian Mountain by plane. Black carbon black absorbed light and heat so hard that the snow with black carbon melted, and a torrent of snow water finally appeared in Qilian Mountain.

(2) Raw eggs and cooked eggs

After placing two eggs on a relatively smooth table, rotate the eggs at the same time with roughly the same force. Stop the raw eggs first, and stop after the cooked eggs. We learned this method on TV in primary school. So what is the principle? The difference between raw eggs and cooked eggs is that the contents of eggs are liquid and solid respectively. When the eggshell is forced to rotate, the eggshell is forced to rotate, but the liquid content remains static due to inertia, and there is a certain friction resistance between them, and there is also friction resistance between the eggshell and the desktop, so the rotation stops soon. The contents of a cooked egg are solid, and the shell is independent. When the eggshell is forcibly rotated, the eggshell and the contents rotate together, and there is no relative movement between them, so it can rotate for a long time only by overcoming a small desktop friction.

(3) Magical magnetized water

Magnetized water is water magnetized by magnetic field. Let ordinary water pass through a magnetic field with a certain intensity at a certain speed along the direction parallel to the magnetic induction line, and ordinary water will become magnetized water. Magnetized water has various magical effects and is widely used in industry, agriculture and medicine.

In industry, people initially only treated a small amount of boiler water with magnetic field to reduce scale. At present, magnetized water has been widely used in the cooling system of various high-temperature furnaces, which plays an important role in improving cooling efficiency and prolonging furnace life. Many chemical plants use magnetized water to accelerate chemical reaction and increase output. The strength of concrete is greatly improved by mixing concrete with magnetized water in construction industry. Textile mills desizing with magnetized water and printing and dyeing mills using magnetized water to match colors have achieved good economic benefits.

In agriculture, seeds are soaked in magnetized water to raise seedlings. The seeds germinate quickly and the germination rate is high. The seedlings have advantages in plant height, stem diameter and root length. Irrigation with magnetized water can loosen soil, accelerate the decomposition of organic fertilizer and stimulate crop growth. Through practice, it was found that soybean, corn, radish, cucumber and other vegetables increased by 10~45%, and rice, wheat and rape increased by118%. In addition, some livestock farms feed poultry and livestock with magnetized water, which can reduce livestock diseases and gain weight quickly.

In medicine, magnetized water can not only kill many kinds of bacteria and viruses, but also treat many diseases. For example, magnetized water is effective in treating various lithiasis (gallstones, bladder stones, kidney calculi, etc.). ), stomach trouble, hypertension, diabetes, cold. For people who are not sick, drinking magnetized water often can also play a role in disease prevention and fitness.

In daily life, washing clothes with magnetized washing powder solution can make clothes cleaner. Interestingly, it is also satisfactory to use magnetized water instead of washing powder.

Why does magnetized water have such a magical effect? This is an unsolved mystery. Some scientists think that the water molecule itself is a small magnet. Because the opposite magnetic poles attract each other, many water molecules in ordinary water will attract each other first, forming a huge "molecular group". This "molecular cluster" will weaken many physical and chemical properties of water. When ordinary water passes through the magnetic field, it breaks through the previously connected "molecular cluster" and becomes a single high-energy water molecule. Of course, to completely uncover the mystery of magnetized water, people need to continue to study and explore.

There are too many magical phenomena in nature and life. We have only made a superficial study of several phenomena, but we still don't understand a lot of profound knowledge. This has increased our interest in learning physics and stimulated our desire to explore. We are eager to open the door of the physical world and travel in the magical physical world.