What s going on with fogging outside the front windshield of the car

The fog outside the front windshield of a car is caused by the temperature difference between the inside and outside of the car.

The temperature inside the cab is cooler than outside, causing moisture outside the cab to condense and form a water mist outside the windshield. This phenomenon is more common in winter.

Here's how to fix fogging outside your car's windshield:

1. Air conditioner defogging: This is the easiest way. Just turn on the front window defogging mode, then turn on the wind speed to the maximum, turn on the AU002FC switch, and then adjust the temperature to the minimum.

After a while, the fog on the glass will disappear. In addition, many vehicles now have a one-key defogging function, which can be turned on again when fogging, which is convenient and fast.

2. Air convection: This method is suitable for very few cases. When the windows are opened, air convection can be increased, reducing the temperature difference between the inside and outside of the car, and reducing the conditions for fog formation.

This approach may seem economical, but there are too few situations where it is really suitable. If it's raining outside, it's impossible to open the windows. In addition, the wind blowing in is quite limited.

3. Mist eliminator: The market of mist eliminator ranges from tens of yuan to hundreds of yuan, and the composition is not much different. Perhaps the only difference is persistence.

To use, simply spray it evenly on the glass surface and wipe it clean with a dry towel. The principle is to use surfactants to retain a certain protective film on the surface of the glass, change the surface tension of water molecules, and make the fog droplets condense into large water droplets, so as not to block the line of sight. Other automotive glass can also be used, especially on exterior mirrors.

Due to the temperature difference between the inside and outside of the car, the temperature inside the cab is higher than the outside, causing moisture in the cab to condense on the inner windshield to form fog. In summer, fog only occurs on rainy days, because the outside air is humid at that time, but the temperature is not low, and when the humid air meets the cool glass, the water vapor will condense into small water droplets, forming fog on the outside of the glass.

The principle is the same as that of fogging the inside of the glass in winter, which is due to the high humidity in the cabin and the cold glass forms fog. So if the air conditioner is turned on in the summer, the windshield will be cooler and more prone to fogging.

Therefore, if the outside of the glass is fogged, do not turn on the air conditioner and use cold air to blow the windshield, it will blow more and more seriously. This is different from defogging the inside of the glass in winter, which can be defogged with a cold wind on, except that the wind blows the glass dry. The most important thing is to use the dehumidification function of the air conditioner to remove the moisture in the cabin, and the water vapor concentration is low, so the air conditioning compressor must be turned on in winter.

Spraying anti-fogging agent prevention method:

Spray a little defogging agent on the car glass window (inner wall) and wipe it clean to remove the dirt and stains on the glass window. While polishing the glass, a thin layer of transparent protective film is formed on the glass, which can effectively prevent the condensation of water vapor on the glass and form a fog layer, which is especially suitable for cold winters.

Alternatives to anti-fogging agents and dish soap, soap, glycerin, alcohol or salt water are allowed to dry before wiping off excess fibers with suede or a soft, dry cloth that will keep the glass from fogging up for a few days.

It is mainly caused by the excessive temperature difference between the inside and outside of the car.

Defogging and dehumidification methods:

1. Turn on the air conditioner (the A C indicator light is on).

2. Select the ventilation mode as: or .

3. The air circulation mode is selected as external circulation.

4. The speed of the blower is selected as the highest gear.

5. The temperature can be adjusted to a suitable position according to the needs (generally: cold air in spring and summer, warm air in autumn and winter).

6. The vent in the trunk can also prevent fogging, pay attention to keep it in an unobstructed state.

The temperature inside the car is low, the temperature outside the car is high, and the water vapor in the air outside the car condenses into small water droplets attached to the glass, which becomes the so-called fog, and the fog is composed of small water droplets.

1.Introduction: When the relative humidity reaches 100%, the water vapor in the air will condense into fine water droplets suspended in the air, reducing the visibility at the ground level, this weather phenomenon is called fog.

Fog is more common in spring from February to April.

Whenever the visibility in the atmosphere is less than 1 km due to the condensation of suspended water vapor, meteorology calls this weather phenomenon fog.

Conditions for the formation of fog:

One is cooling, and the other is humidification to increase the water vapor content.

The types of fog are radiation fog, advection fog, mixed fog, evaporative fog, and smoke.

2.Cause: Saturation is reached when the water vapor contained in the air reaches its maximum. And the temperature of the air.

The higher it is, the more water vapor can be contained in the air. 1 cubic meter of air, when the air temperature is 4, the maximum amount of water vapor that can be contained is grams; When the air temperature is 20, 1 cubic meter of air can contain a maximum of grams. If the air contains more water vapor than the amount of saturated water vapor at a certain temperature, the excess water vapor will condense and when enough water molecules combine with the tiny dust particles in the air, and the water molecules themselves will bond to each other, becoming small water droplets or ice crystals.

The amount of water vapor in the air exceeds the saturation amount and condenses into water droplets, which is mainly caused by the drop in air temperature. This is also the reason why autumn and winter mornings are foggy.

3.Formation conditions: The conditions for the formation of fog are cooling, humidification, and condensation nuclei to increase the water vapor content.

A kind of fog is formed by radiative cooling, and most of them appear at night and early in the morning when it is clear, breezy, and the water vapor near the ground is relatively abundant and stable, or there is a temperature inversion, which is called radiation fog in meteorology; The other is the fog formed by the horizontal movement of warm and moist air, passing through the cold ground or water surface, and the water vapor in the air is gradually liquefied by cold, which is called advection fog in meteorology; Sometimes fog formed by both causes is called mixed fog. It can be seen that these conditions can be met in late autumn and early winter, especially in the morning of late autumn and early winter.

4.Color: Experimentally Proven:

When white light hits a transparent object, the light it passes through is mainly the same color as the transparent object, and the other colors are absorbed by the transparent object. If a transparent object can transmit light of all colors, then the transparent object is colorless, such as ice. However, when the water turns into fog, many reflective surfaces are formed.

At this time, the light cannot pass through, but is reflected, that is, the light of various colors is reflected, so the fog becomes white.

There is only one possibility of fogging outside, that is, the outside environment is humid and very hot, and the air conditioner is turned on inside your car, and the temperature is very low, causing the moisture in the outside environment to condense into water on your car glass, which causes you to make it useless. To put it simply, you spend a lot of time in an air-conditioned room in the summer, and suddenly you go outside and your glasses are full of fog. Typing is not easy, towards.

You just turn up the temperature of the air conditioner, because your air conditioner is too cold and hot outside, so it will form fog outside your windshield, or you can use the windshield wipers to brush off the fog.

It is impossible to fog outside, you turn on the air conditioner and press the front gear defogging button to have the defogging effect.

The fogging outside the front windshield of the car is caused by the temperature difference between the inside and outside of the car, and the temperature in the cab is lower than the outdoor temperature, causing the water vapor outside the cab to condense outside the windshield to form water mist, which is more common in winter.

How to solve fogging outside the front windshield?

1. Air conditioning defogging.

This is the easiest way, just turn on the front window defogging mode, then turn the wind speed to the maximum, turn on the A C switch, and then turn the temperature to the lowest, and the fog on the glass will disappear in a while. In addition, the rear windshield and exterior mirrors of some models are equipped with electric heating, which can be used to eliminate fogging in about a minute after the switch is turned on. In addition, many vehicles now have a one-key defogging function, which can be turned on when fogging, which is convenient and fast.

The above situation is suitable for the summer rainy season, but in winter, you can take the air conditioning hot air defogging, if the car has just started, do not start the air conditioning for the time being, wait until the engine is preheated for a few minutes, after the water temperature comes up, then start heating, adjust the air volume to the maximum, and then also turn on the front window defogging mode, and the fog will disappear in a few minutes.

2. Air convection.

This method is suitable for very few situations, after opening the window, it can increase air convection, reduce the temperature difference between the inside and outside of the car, and weaken the fog formation conditions, this method seems to be very economical, but the situation that is really suitable is too little, if it is raining outside, it is impossible to open the window, and the wind blowing in is also quite limited.

3. Defogging agent.

The above two methods are emergency measures in case of fogging, so is there any prevention in advance? Of course, there are ** defoggers on the market ranging from tens of yuan to hundreds of yuan, and the ingredients are not much different, and the only difference may be the durability. To use it, you only need to spray it evenly on the glass surface and wipe it clean with a dry towel.

Its principle is to use the method of surfactant to retain a certain protective film on the surface of the glass, change the surface tension of water molecules, and make the fog beads condense into large water droplets, so as not to block the line of sight. Other glass in the car can also be used, especially in exterior mirrors.

In fact, fogging outside the windshield is generally due to the fact that the temperature outside is relatively high, the temperature inside the car is relatively low, and the humidity outside the car is relatively large. It can be scraped with wipers or ventilated with windows open.

I think the fogging of the inside of the glass is caused by the high temperature in the cab, and if the outside fogs up, the temperature in the cab is too low, absorbing the heat in the outside air and changing from gaseous to liquid.

[Method 1: Install a rain shield]**: Principle ranging from a few yuan to dozens of yuan:

The "rain shield", also known as the "rearview mirror rain eyebrow", is made of high-grade resin material, which can be bent arbitrarily and glued to the rearview mirror through special double-sided tape, the effect is like holding up a small umbrella on the rearview mirror. Pros and cons: If the rain falls vertically from the sky, it works well.

However, for the rain that falls obliquely, the effect is poor, which is the same as a person holding an umbrella vertically, and the rain that blows obliquely will still get people wet. [Method 2: Install a heated rearview mirror]**:

Hundreds of yuan to thousands of yuan principle: through heating, so that the raindrops can not stay on the mirror surface of the rearview mirror. When the rearview mirror is heated, the small condensed water droplets are quickly evaporated.

Pros & Cons: **Higher and requires a professional to operate. However, some also come with blue mirrors (i.e., when driving at night, even if the rear headlights shine on your car's rearview mirror, it will not look dazzling and play an anti-glare function), wide-angle (using multi-curved surface technology, a large field of view, and a more realistic image), etc., which increase the function and safety of the car.

What to do if the outside of the car windshield is fogged?If there is fog inside the front windshield, then it is because when it rains, cold water is poured on the front windshield glass, forming an environment that is cold outside and hot inside, so that there will be fog in the front windshield position, you can turn on the air conditioner refrigeration, and the front windshield can be defogged by blowing the front windshield at the air outlet position, if there is fog outside the front windshield glass, then it is because the temperature of your air conditioner is adjusted too low, and the front windshield position is blown directly, forming an environment that is cold inside and hot outside. Therefore, the fog outside the front windshield glass can be solved by appropriately raising the temperature of the air conditioner, or switching the position of the air conditioning outlet. The easiest way to fog up the front windshield is to turn on the air conditioner and blow it to reduce the temperature difference between the inside and outside of the glass surface and avoid condensation and fogging

Many cars are equipped with a defogging function, just turn down the temperature of the air conditioner and turn on the defogging functionDefoggers can also be used, which are now available on the market, and spraying them on the windshield can effectively reduce fogging

From the web.

There are two main reasons for the fogging of the windshield, which has always been the fogging caused by the water vapor exhaled by the personnel in the car, which mainly occurs on the glass measured in the car, and the other is whether it is on the inside or outside of the glass, as long as the temperature difference and humidity inside and outside the vehicle meet the requirements, it will cause condensation, and the moisture in the air is condensed into water droplets, thus causing fogging, the fogging of the glass of the vehicle, especially the fogging of the front windshield, will seriously obstruct the line of sight, and the poor handling will bring serious safety hazards. In fact, the solution is also very simple, because the cause of fogging is caused by the temperature difference between the inside and outside of the glass, so as long as the temperature difference between the inside and outside of the car glass is balanced by warm air or cold air, the problem can be solved, if it is foggy outside the glass, you can also quickly remove the fog outside through the wipers, and then balance the temperature through warm air or cold air.

How to effectively solve the fogging of the front windshield of the car? Have you learned all these 4 tricks?

It is caused by the temperature difference between the inside and outside of the car, and the temperature inside the cab is lower than the outside, causing the water vapor outside the cab to condense outside the windshield to form a water mist.

The water molecules in the air are constantly moving irregularly. When there is no temperature difference, water molecules keep hitting the glass and flying out of the glass. Because the lower the temperature, the slower the rate of movement, so after the water molecules hit the cold glass from the hot air, the movement slows down and cannot fly out in time, while the water molecules outside are still hitting the glass, so the water on the glass is more and more, and finally gathers into small water droplets.

Saturation pressure can be understood as the maximum amount of a certain gas (such as water vapor, alcohol vapor, etc.) that can exist in the air at a certain temperature, and when the actual amount of a certain gas in the air is greater than this amount, it will be liquefied.

The glass and water are infiltrated, so the water is aerosolized back on the glass, but the mercury does not fog up. Therefore, the principle of some glass defoggers is to cover the surface of the glass with a film that does not infiltrate with water.