In the middle of summer, when you enter an air conditioned house, who is the first person to feel co

The first people to feel cool are: those who wear black.

Black clothes absorb heat quickly, so the person wearing black clothes feels hotter than others, and when he enters the air-conditioned room, because the temperature difference is larger, he feels cool first.

Black clothes absorb various wavelengths of visible light, so the temperature tends to rise, so wearing black clothes in the sun will feel hotter. In the shadows, the temperature of the black clothes, which is originally heat-absorbing, is higher than the environment, and in order to achieve thermal balance, it will quickly dissipate heat. Radiation can be emitted from any object with a temperature, and the higher the temperature, the more heat is released.

In addition, the darker the color, the rougher the surface, the easier it is to diverge radiant heat, and similarly, the darker the color and the rougher the surface, the easier it is to absorb radiant heat; On the contrary, the color is light and the surface is smooth, so it is not easy to absorb or dissipate radiant heat. Therefore, black absorbs heat quickly and releases heat quickly.

Black doesn't reflect any light at all, it absorbs all of it, including infrared rays, so it gets the most energy, so it feels hot. The light emitted by the light source is a kind of electromagnetic wave, including infrared, visible light, ultraviolet light and some other rays, visible light is usually visible red, orange, yellow, green, blue, indigo, in addition, there are infrared rays on the side of red light, which are invisible and have a thermal effect. On the violet side there is also ultraviolet light, which has a germicidal effect.

The reason why you see an object is colored is because it reflects that visible light.

White reflects all light, heat:

But it reflects the heat energy from the outside as well as the heat emitted by the body; Wearing white clothes makes it easier for heat energy to lock in the body.

In addition, the heat dissipation is not as good as black, so white clothes are not only not cooler than black, but hotter.

The answer is a white. Because the black color is too absorbent, it is necessary to slow down when entering the air-conditioned room. And white can feel cool directly.

Dizzy, is this asking again or is it a quiz.

Summer is coming, the sun is scorching, the heat is unbearable, then we will use air conditioning to cool down, but what to do in ancient times without air conditioning? In fact, the ancients could easily spend the summer with the help of many excellent inventions.

Fan! If you don't want to go out, people can enjoy the slightest coolness in the house, as long as the ordinary fan is modified and assembled, it becomes a special cooling facility, similar to the current electric fan.

Skilled craftsmen in the Han Dynasty developed a large fan called "impeller dialing the wind", which can produce strong wind power. RememberAccording to the "Xijing Miscellaneous Records", which recorded the story of the Han Dynasty, Chang'an craftsman Ding Shu made a large fan with a diameter of too many feet, and only one person needed to shake the handle, and the seven impellers would rotate rapidly, producing a continuous cool breeze.

In the Tang Dynasty, "cool houses" appeared in Chang'an and other places. The "cool house" is built near the water, and a large fan wheel is pushed by a waterwheel to bring cool air into the house. In some houses, there are also "artificial waterfalls" and "water curtain holes".

Build a pool in the middle of the house, then use a water truck to carry the water from the pool to the roof, and then flush it into the pool, so that the flow of water takes away the heat in the house, and the temperature drops.

At this time, a kind of water pavilion also appearedPavilions were built in ponds, and water from the ponds was transported to the top of the pavilions by machinery, and stored in jugs. When it's hot, let the water flow down from all around the pavilion to form a rain curtain, which not only cools down, but also has a great view.

In Kaifeng, the capital of the Song Dynasty, there was a "cool hall" dedicated to the emperor. In the hot summer, dozens of shelves were placed in the palace where the emperor worked, and on top of them were golden basins filled with ice cubes, revealing a slight coolness. The ice had been excavated and stored the previous year for royal use.

There is also a kind of cool hall, is the upgraded version of the cool house in the Tang Dynasty, the pool in the house is as big as ten acres, not only there is a waterwheel to transport the cool water to the roof, and then rush into the pool in the house, and the pool is also planted with various colors of lotus flowers, hundreds of pots of fragrant flowers are also placed in the house, the wind wheel blows, the fragrance of flowers fills the hall. There was once a ** who was summoned here, and he had a cold war on dog days, so the emperor gave him a piece of fabric to drape on his body, which showed that the effect of the cool hall was amazing.

Summary: There are also facilities in private villas to escape the heat and cool off. For example, the Ming Dynasty literati Gao Lian once mentioned a "Huodu Villa", which is to dig seven wells in a room, and the wellheads are carved with exquisite patterns.

These ancient "air-conditioned rooms" were much more environmentally friendly than today's, but they could only be enjoyed by emperors or wealthy families, and had no chance with ordinary people.

They will use fans to relieve the heat or mats, and they can also use some refrigerated food to cool down, and some large families will also put some ice cubes indoors to cool down.

They sleep on porcelain pillows, or cool off under grape trellises, they will have cold drinks, they will have all kinds of fans, or they will just endure it.

The royal family would use ice cubes to cool off, and plant shade or trees around the house, and the common people would not go out unless necessary in the summer.