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That’s why you should never leave a water bottle in the car.

articleUseronApril 22, 2026

Leaving bottled water in the car can be dangerousCar Dealer

It’s a common habit for many drivers to leave a water bottle in their car. However, in reality, bottled water can pose a fire hazard if placed in certain places in hot weather.

In the summer, almost everyone carries a water bottle with them to avoid having to walk in the scorching sun just to buy one. For car owners, it is very common to leave a water bottle inside the car, often on the dashboard or next to the driver’s seat.

In an experiment conducted by Dioni Amuchastegui, an electrical engineer in Idaho (USA), it was shown that a water bottle can refract sunlight and generate heat above 100 °C. When placed on a dark surface – such as a car seat – the concentrated heat can ignite a fire and cause a disaster.

In fact, several conditions must be met for a water bottle to start a fire inside a car. But that doesn’t mean it can’t happen. Amuchastegui came close to experiencing such an event himself, which prompted him to conduct the experiment as a public warning.

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If the weather is mild, leaving water in the car is not a problem. But when the vehicle is parked in direct sunlight in the middle of the day, it’s a different story. The seemingly harmless water bottle can literally turn your car into a “fire engine.”

The reason is that water bottles, which are usually spherical and made of transparent plastic, can act as magnifying glasses. When filled with water, they can focus sunlight onto a single point. At noon, the temperature inside a car can reach almost 60°C. When sunlight passes through the bottle and is concentrated in one spot, the heat can rise even higher, creating a fire hazard.

Many people admit that they often leave a water bottle on the seat without imagining the serious consequences. In addition, some automotive experts point out another risk: bottles placed on the passenger seat can roll off and get stuck under the brake or accelerator pedals. In emergency situations where the driver has to brake suddenly, a bottle stuck under the brake pedal can be extremely dangerous. ️️ Continue on the next page ️️

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