Which measure helps prevent interior windshield fogging during humidity or rain?

Which measure helps prevent interior windshield fogging during humidity or rain?

• A. Roll down the windows
• B. Use the defroster or air conditioner
• C. Turn on the heater only
• D. Wipe condensation with a towel

Answer: (B)

Fogging happens when moist air inside the car hits the cooler windshield, causing water to condense on the glass. The best way to clear it is to remove that moisture and direct air to the windshield. The defroster does exactly that by blowing air up onto the glass, helping to push the humid air away. Using the air conditioner helps remove humidity from the cabin, which reduces fogging more quickly. Using the heater alone only warms the air and doesn’t dry it, so it won’t effectively clear the fog. Rolling down the windows can help temporarily but isn’t practical in rain and isn’t as efficient. Wiping with a towel is a quick fix but only removes surface moisture for a moment and doesn’t address the humidity issue. For a fast, lasting clearing, use the defroster and the air conditioner to dehumidify and clear the windshield.

Fogging happens when moist air inside the car hits the cooler windshield, causing water to condense on the glass. The best way to clear it is to remove that moisture and direct air to the windshield. The defroster does exactly that by blowing air up onto the glass, helping to push the humid air away. Using the air conditioner helps remove humidity from the cabin, which reduces fogging more quickly. Using the heater alone only warms the air and doesn’t dry it, so it won’t effectively clear the fog. Rolling down the windows can help temporarily but isn’t practical in rain and isn’t as efficient. Wiping with a towel is a quick fix but only removes surface moisture for a moment and doesn’t address the humidity issue. For a fast, lasting clearing, use the defroster and the air conditioner to dehumidify and clear the windshield.