Why does it feel cool to fan a fan in summer

In summer, fans feel cool, because fans speed up the evaporation of human sweat, thus taking away part of the body's heat, so they feel cool.

In summer, the fan will speed up the flow of air, although this can not reduce the temperature, but by speeding up the flow of air, the sweat of the human body will evaporate quickly, evaporation is a process of absorbing heat, sweat will absorb part of the heat from the human body when it evaporates, so we will feel cool.

The temperature in summer is very hot, we should do some measures to prevent heat stroke, do not be exposed to the sun for a long time, do not do strenuous exercise, you can eat some cool fruits and food, to relieve the feeling of heat.

When fanning the fan, the flow of air on the surface of the sweat is accelerated, the evaporation of sweat is accelerated, and the sweat evaporates to absorb heat to the **, so that people feel cool.

Faster air flow This will speed up the evaporation of sweat from the surface.

Evaporation absorbs heat, so it's cooler!!

Accelerates the evaporation of surface moisture and speeds up air flow. It is the cause of evaporative refrigeration.

The fan increases the air flow, takes away the moisture on the surface faster, and the moisture vaporizes and absorbs heat, taking away the heat of the body, so the human body will feel cool.

Accelerates evaporation, because evaporation dissipates heat!

The air flow accelerates** the evaporation of sweat on the surface

Because there is a pressure difference, wind is formed. It then flows quickly to the body, speeding up evaporation. The evaporated moisture takes away the temperature of the body, so it feels cool.

Thank you**.

Accelerates the evaporation rate of the surface.

The wind blown by the fan will take away the hot air around you. So it will feel cool.

The surface temperature of the human body is more than 30 degrees. The general indoor air is more than 20 degrees. If the air is not moving, it will heat up the surrounding air, and this heated air will hinder heat dissipation. And the fan will take away this hot air.

Blowing a fan can speed up air circulation, which speeds up the evaporation of human sweat, reduces body heat, and lowers the body temperature, so that the person will feel cool. To correct a misconception, the fan does not lower the temperature of the air, but because the flow of air accelerates evaporation, thus bringing heat from the body surface to the air.

How it works. The main component of the electric fan is: AC motor. Here's how it works:

The energized coil rotates by force in a magnetic field. The form of energy conversion is: electrical energy is mainly converted into mechanical energy, and at the same time, because the coil has resistance, it is inevitable that some electrical energy will be converted into thermal energy.

When the electric fan is working (assuming that there is no heat transfer between the room and the outside world), the temperature in the room will not only not decrease, but will rise. Let's analyze the reasons for the temperature increase: when the electric fan is working, because there is an electric current through the coil of the electric fan, the wire is resistive, so it will inevitably generate heat and release heat to the outside, so the temperature will rise.

The fan fanned the air around you, which accelerated the flow of air, which also accelerated the evaporation of your sweat, and the evaporation of sweat took away the heat, so you are cool, junior high school physics has an explanation.

The main principle of the electric fan is to drive the fan blades to rotate through the motor, accelerate the air circulation around the human body, and the human body evaporates water from the pores of the human body at an accelerated rate, and the heat taken away by the water evaporation process increases, and people feel cool.

Hello! In layman's terms, when people are hot, their bodies secrete sweat.

The role of the electric fan is to blow the air, that is, to help the sweat evaporate.

The evaporation of sweat containing water needs to absorb heat, and at the same time, it takes away part of the heat from the body, so people will feel cool.

Especially when you are covered in sweat and there is no wind for a long time, a gust of wind blows, even if it is hot air, it will be more comfortable than no wind at all.

Hope it helps.

The fan blows outside the window, and it will be cool inside.

Blowing the electric fan at an open window and at the same time pulling away for a certain distance will blow the hot air in the room to the outside as if the air was running into a plastic bag, and the whole room will be cooled as a result. When the fan is far away from the window, the anemometer data is best.

Precautions for fan use

1. Pay attention to the position of the electric fan when the gear is opened.

The position of the electric fan and the human body should not be too close, if it is too close, the gap between blood circulation and sweat circulation will be too large, and if it blows like this for a long time, the human body will feel tired and feel uncomfortable all over the body. The best position of the electric fan is about 2 meters away from the human body, so that the wind is softer and more even.

2. Don't blow directly at people for a long time.

The electric fan must not blow directly on people, otherwise it is easy to cause a cold, and you will have sore arms and legs the next day. Therefore, the electric fan should be set to rotate the head, so that it will be better and the damage to the body will be less.

3. Set the wind speed.

The wind speed of the electric fan should not be too large, so as to ensure that the human body has an adaptation process. The indoor wind speed is better controlled in a small block, especially in the room with good ventilation and in the place where there is excessive wind, the wind speed of the fan should not be too large.

Fourth, try to time the electric fan.

When blowing a fan at night, don't blow it all night, it's not good for your body. Most fans have a timing function, so try to time the electric fan as much as possible, and as long as you fall asleep, you won't feel hot. This not only saves electricity, but also is good for the body.

Because the electric fan accelerates the flow of air, and the flow of air can accelerate the evaporation of sweat on people's bodies, and the evaporation of sweat can take away heat, so people will feel cool.

At the same temperature, when the density of water molecules in the air (commonly referred to as humidity) is relatively small, it means that the number of water molecules jumping out of the air into the liquid water is much smaller than the number of water molecules escaping from the liquid water, and the lower the density of water molecules in the air at the banquet ridge, the greater the difference in the number.

The effect of the wind blown by the fan is to blow away the water molecules in the air on the surface of the liquid water and replace it with drier air. In this way, evaporation can continue at a relatively high rate, and the person will feel relatively cool.

When the fan is fanned, it will touch the wind, mainly to increase the air flow, so that the air around the human body is at a lower temperature, accelerate the heat transfer speed between the human body and the air, and it is conducive to the evaporation of human sweat, and the evaporation of sweat is also conducive to cooling. So a fan will feel cool.

Fan Fan will have wind and make use of the physical principle of air movement.

The biggest difference between the wind of an electric fan and the natural wind is:

The natural blue wind is advection, like a river.

The wind of the electric fan is like the water behind the propeller, it is rolled, and it is a horizontal whirlpool.

When the fan is fanned, the air flow speed in the area being fanned is accelerated, and the air pressure is small, which causes the air pressure difference, which creates wind, and the fast flowing wind will speed up the evaporation of the liquid on the surface of the body, and the evaporation will absorb the heat from the body, so it will make the human body feel cool.

The types of fans include feather fans, pu fans, pheasant fans, group fans, folding fans, silk palace fans, mud gold fans, black paper fans, sandalwood fans, etc.

The fan was first called a fan and has a history of more than 2,000 years in China. It was not originally used to cool off, but as a ritual tool. Gradually, the fan transformed from a symbol of status and power to daily necessities and handicrafts such as coolness, entertainment, and appreciation.

The styles of fans mainly include wavy type, monk head type, collection style, pointed head type, Japanese style, thin tip type, fish tail type, etc. Content.

Because the electric fan accelerates the flow of air, and the flow of air can accelerate the evaporation of sweat on a person's body. The evaporation of sweat can take away the heat, so the person will feel cool.

Use an electric fan to blow the thermometer, and the thermometer indicates that the temperature has not dropped. This means that electric fans cannot cool the air.

So, why does blowing a fan feel cool? There is such an experience in daily life: after a period of time, the water on the clothes will turn into water vapor and run away, and the clothes will become dry.

The process by which a substance changes from a liquid state to a gaseous state, which occurs only on the surface of the liquid, is known as evaporation. If you wrap a damp cloth around the alcohol ball of the thermometer and then blow the thermometer with an electric fan, thereby accelerating the evaporation of water on the damp cloth, you will find that the alcohol column of the thermometer drops, indicating that the temperature of the water on the damp cloth has decreased.

This occurs because water evaporates and consumes energy to absorb heat from surrounding objects. Rubbing a little alcohol or water on it will feel cool, which is due to the fact that alcohol or water evaporates from the human body and lowers the temperature. When the weather is hot and humid in summer, the sweat on the body is difficult to evaporate, after the electric fan is turned on, the flow of the surrounding air is accelerated, on the one hand, it drives away the hot air that surrounds the surface, on the other hand, it also accelerates the evaporation of sweat, taking away more heat from the body, so people feel cool when blowing the fan.

Answer: In the hot summer, there is sweat on the surface of the human body, and the evaporation of sweat will absorb heat from the human body, and the wind blown by the electric fan accelerates the air flow on the surface of the sweat, thereby accelerating the evaporation of sweat, that is, the speed of heat absorption from the human body is accelerated, so people feel cool