It might seem harmless to keep a plastic water bottle in your car—after all, staying hydrated is important. But firefighters across the country are warning against this common habit, especially during sunny weather. The reason? Under the right conditions, that bottle could start a fire.
The Hidden Fire Risk
A plastic water bottle left in direct sunlight inside a vehicle can become a fire hazard. It may not look dangerous, but it can function like a magnifying glass, focusing sunlight into a beam hot enough to ignite flammable materials such as fabric or paper.
When sunlight passes through a clear plastic bottle filled with water, it can focus the light into a small point. Just like using a magnifying glass to start a fire, this concentrated beam of heat can burn car upholstery or other surfaces if the bottle is angled just right and left in direct sun for too long.
This isn’t just a theory. In 2017, a man in Idaho noticed smoke coming from his truck seat—caused by sunlight refracting through a water bottle. Similar reports have surfaced nationwide, showing that even a quick stop in a sunny parking lot can create the right conditions for ignition.
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