Why Does the Outside of the Glass Fog Up?

[CarmenRose]

The fogging of the windshield is caused by the significant temperature difference between the inside and outside during winter. Here are some solutions for defogging car glass: 1. Use an anti-fog agent: Spray a small amount of defogging agent on the car window and wipe it clean. While polishing the glass, it forms a thin transparent protective film that effectively prevents the condensation of moisture on the glass, thus avoiding fogging. 2. Utilize air convection: Due to seasonal temperature differences, the warm and humid air inside the car meets the cold windshield, leading to heat release and liquefaction, which easily causes fogging. 3. Use the car heater: Turn on the heater and direct warm air onto the glass to quickly raise the temperature of the front glass, eliminating the conditions for the warm and humid air inside the car to release heat and liquefy on the window glass, thereby preventing fogging.

[Kaleb]

As someone who drives frequently, I often encounter fogging on the outside of the windshield, especially on rainy or cold days. This happens because the low temperature outside cools the glass surface, and when the warm air from the car's heater plus the moisture from my breath hits the cold glass, it condenses into water droplets. Dirty windows make the situation worse, as stains absorb moisture and fog up more quickly. To prevent this, I regularly wash my car and clean the windows, wiping the surface after each use. Dealing with it is simple: using the windshield wipers to remove the water droplets or turning on the defrost mode of the air conditioner for a few minutes can clear it up. For prevention, I use the air conditioner's external circulation more often and avoid using the heater's internal circulation. These small habits keep my driving safe and steady, ensuring I don't lose visibility and get into accidents. Regular vehicle maintenance is also crucial, so don't forget about it.

[Carolyn]

I've studied the reasons for fogging on the outside of glass, and it's primarily a physical phenomenon caused by temperature differences. The outer glass is cold, and when warm, moist air from inside the car comes into contact with it, it condenses into water. This is more noticeable during periods of high humidity, like the rainy season, and poor ventilation can exacerbate the problem. The solution is to use the air conditioning's dehumidification function with high fan speed or crack the windows slightly to allow air circulation. Keeping the glass clean is crucial; I wash my car weekly to prevent dirt buildup. Checking if the wipers are effective can help quickly address sudden fogging. These simple methods help avoid the risk of impaired visibility.

[LeLincoln]

When I encounter fogging on the outside of the windshield, I immediately become alert because blurred vision is extremely dangerous, especially at night or on highways. My first response is to turn on the wipers to remove the moisture or switch the air conditioning to the defrost position to clear my view. Safety comes first: if the fog can't be cleared, I promptly pull over to a safe spot to handle it. In daily life, I emphasize keeping the windows clean; wiping off dust during each refueling helps reduce buildup. I often set the air conditioning to external circulation to minimize interior humidity sources. Prevention is better than cure—these small measures have safeguarded every trip I take.