What causes the glass outside the car to fog up when the air conditioner is turned on at night?

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.

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 fog formation: one is cooling, the other is humidification, increasing the water vapor content.

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

Cause: Saturation is reached when the water vapor contained in the air reaches its maximum. And the hotter the air, the more moisture it can hold.

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.

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.

Color: Experiments have shown that when white light hits a transparent object, the light it passes through is mainly the light of the same color as the transparent object, and the other colors are absorbed by the transparent body.

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.

This is caused by the large difference between the temperature of the inner surface of the glass and the air temperature in the car, which is generally caused by the air conditioning direction you choose to blow only the glass, blow the glass at the same time and blow the front of the passenger and the front and feet of the passenger at the same time.

Here's how to fix it:

When catching up with rain and snow, there is no need to use cold air or internal circulation air to defog, as long as the defogging water is prepared and applied to the windshield before this. The preparation method of defogging water is extremely simple, now almost every family has something like washing spirit, which is a necessary cleaning product in the kitchen, you just need to find a small utensil, squeeze in a little washing spirit, mix it with water in a ratio of about 1:10, and then use absorbent cotton or soft cloth dipped in it to apply it to the inside of the front and rear windshield (including the window glass at the rearview mirror), and then use suede or soft dry cloth to wipe off the residual fibers left on the windshield after drying.

Once applied, it can ensure that it works when it rains for several days in a row, and the glass is very bright. If you catch up with the weather with too much humidity, when the temperature difference between the inside and outside of the car is large, you can slightly increase the proportion of washing spirit.

It is caused by a large temperature difference between the inside and outside of the car.

You can open the windows to allow the air to convection: the air outside the car forms a convection current, the temperature difference decreases, and the fog disappears, which does not increase fuel consumption. Or you can turn on the front windshield defogging button on the center console, and then adjust the air outlets to align the front windshield, which can basically achieve instant defogging.

Glass fogging solution:

1. Air conditioner and fan in the car: The common method is to turn on the fan and refrigeration switch in the car, and the cold air blows to the windshield to sweep away the fog. The effect is very good, but there are also drawbacks, that is, the people in the car will be colder.

2. Open the window air convection: you can open a gap between the windows on both sides, the air in the car is convection, the temperature in the car is slowly close to the temperature outside the car, and the fog will disperse.

3. Use anti-fog products: This kind of product is evenly sprayed and wiped clean on the car window, it will form a transparent protective film on the glass to prevent fog generation, and spraying once can prevent fog for ten days to half a month.

Ways to prevent fogging:

1. Try to use insulating glass, which can greatly avoid the occurrence of this phenomenon.

2. A glass gasket should be installed, and the middle spacer should be arranged 1-2mm away from the glass and 3-4mm away from the bottom of the glass. In this way, the septum strip can avoid contact with water, of course, you should choose ***, the septum with low water absorption rate is better.

3. The sealing of the glass should be tight, and the operation should be careful and careful, and the main reason for the problem in actual production is caused by poor sealing.

4. Putting a layer of glass glue on the outside of the bottom separator can alleviate the contact of the separator with rainwater.

Hello oh dear, the fog outside the windshield of the car air conditioner is caused by the following two points: 1The moisture in the air was blown onto the windshield and condensed into a mist.

This usually happens in humid or rainy celebratory weather, where the humidity in the air is high. When the air is set to a lower temperature, the cold air formed lowers the temperature of the windshield, causing the moisture in the air to condense and form a fog. 2.

The humidity of the air inside the car is too high. Usually this situation can be caused by improper humidity regulation in the car, or moisture entering the car. When the air humidity is too high, the moisture in the air can form a fog between the surface of the windows.

Here are some things you can try:1Adjust the air vents of the air conditioner.

Adjust the air outlet to blow as little cold air onto the windshield as possible. 2.Make sure the humidity inside the car is normal.

You can regularly check the interior of your car for moisture and keep it clean and dry. 3.Clean the surface of the window.

You can use in-car air circulation and high-speed mode to remove moisture from windows when fog and rental gas appear, or use a professional car glass cleaner to clean window surfaces. <>

It is because the outside air is hot, while the air inside the car is cooler, and when the combination of cold and heat is combined, fog will be generated.

The cause of fogging in the windshield of a car is caused by the temperature difference between the inside and outside and the humidity of the air.

If the temperature inside the car is high and it is cold outside, the moisture inside the car will condense onto the cold glass, forming a fog. At this time, it is usually necessary to turn on the air conditioner and adjust to the position of blowing glass, and use warm air to blow the fog away. But the heat brings a larger fog for a short time before the glass is heated.

Therefore, you can use cold air to blow the glass, or open a little window, so that the temperature of the glass is consistent inside and out, and there will be no fogging.

In some parts of the south, the opposite is true, where the temperature inside the car is low and the outside is hot and humid, and the moisture will adhere to the cooler outside of the glass. It can only be removed with wipers. Or pay attention to the air conditioning gear to prevent the cold air from blowing into the glass inside the car, and it will also avoid fogging outside.