Wednesday, February 27, 2019

How to defog car windows and windshield in 3 steps

Did you know that on a cold day when you are in the car, you are the one who causes the windows to fog? Remember that human beings exhale warm moist air. When the doors and windows are closed, this moisture accumulates. It then comes into contact with the cold windshield and condenses, releasing it's heat to the surroundings. This precipitates as fog obscuring the windshield. That's why it forms on the inside of the windshield. To remove frost from windshield there an article written on that. Here we look at how you defog car windows.





Now that you know the science behind the process, it's easy to figure out how you can remove the fog. Follow these strategies:

1. Balance temperatures


Turn the AC to minimum and the fan to maximum to rapidly lower the inside temperature. This prevents the moisture from condensing on the windshield as there will be no heat exchange. The drawback is the interior becomes very cold and uncomfortable. Use this in emergencies when you want the fog gone very fast. Don't forget to turn on the defrosters so that the cold air hits the windshield.

2. Turn off the re-circulation feature


This prevents humid air from continuously circulating inside the car. If fresh air comes into the car the moisture levels will balance out and there will be less chances of fog building up.

3. Crack a window


This allows fresh cold air from outside to enter the car and also for warm humid air leave the car. This also causes a balance of moisture levels inside and outside hence less fogging of the windscreen

Conclusion: defog windows


You may have noticed that there was never a sentence where 'turning on the heat' was mentioned. Whatever you do, don't turn on the heat. The heat will accelerate the condensation process and cause further fogging. I've seen people driving and using a cloth to try to remove the fog while the AC is at maximum temperature. Don't be one of them, simply apply the above strategies to defog car windows and you will be OK.

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