Plastic Water Bottles Left In The Sun Could Set Your Car On Fire – Here’s How

A water bottle-induced car fire requires a set of extremely specific circumstances to occur. Firstly, it needs to be a very sunny day, the kind of sunny day that makes your steering wheel so hot that you can’t even touch it. Secondly, there needs to be a plastic water bottle somewhere in your car where the sunlight can reach, such as in the passenger seat. Third, the bottle needs to be clear, and full of a clear liquid like water.

If a plastic bottle is left in your car and the right amount of sunlight hits it at just the right angle, a car seat could catch fire. This video shows how

[Midwest City Fire Department: https://t.co/VqmX6jnkwJ]pic.twitter.com/hQkl52c1Fp

— Massimo (@Rainmaker1973) June 1, 2023

If all of these conditions coalesce and you’re especially unlucky, the sunlight will pass through the clear plastic of the bottle and become magnified by the water, which functions like a lens. That magnified light focuses on a singular point, reaching temperatures of over 400 degrees Fahrenheit. If that point is made of flammable material, it could ignite. Have you ever seen a kid trying to set an anthill on fire with a magnifying glass? It’s the same thing.

So, how do you prevent this from happening? Simple: don’t leave full water bottles in your car. If you absolutely need to leave a bottle in your car, try to leave it somewhere out of direct sunlight, like on the floor, or cover it with something solid like a hat.