What Causes Frost on the Inside of Car Windows in Winter?
2 Answers
The reason for frost forming on the inside of car windows in winter is the temperature difference between the inside and outside of the vehicle. The interior temperature is higher than the outdoor temperature, causing the car windows to come into contact with the colder external environment. This results in the condensation of moisture from the cabin air on the glass, forming frost. Solutions to prevent frost on car windows in winter include: 1. Applying anti-fog spray, which forms a transparent protective film on the glass; 2. Using the air conditioning's dehumidification function to reduce air humidity; 3. Utilizing the warm air function of the air conditioning to minimize the temperature difference and eliminate frost on the windows. Methods to avoid frost on car windows in winter are: 1. Applying soapy water, detergent, ethylene glycol, glycerin, or polyvinylpyrrolidone; 2. Coating with thick plastic film treated with silicon and then applying hydroxyethyl methacrylate silicone; 3. Applying a solution of carboxymethyl cellulose and salt to the glass.
I often encountered this issue last winter, mainly because the residual moisture inside the car condenses into frost when it meets the cold glass after parking. The greater the temperature difference between the inside and outside of the car, the more likely it is to frost, especially on snowy days when snow brought in by shoes melts, trapping all the moisture inside. The water vapor from breathing also accumulates continuously in the enclosed space. Many people are accustomed to turning off the air conditioning before parking, but the correct approach is to switch to external circulation and open the windows for ten seconds when nearing the destination, allowing the inside and outside air to circulate and carry away the moisture. Additionally, placing an old towel on the dashboard while parking can absorb a significant amount of moisture, greatly reducing frost on the glass the next day. Remember, never use a snow scraper to remove the inner frost layer, as it can scratch the coated glass.
