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The molecules that make up the air inside the car get heated up by the sun causing them to move faster and grow farther apart building up the air pressure inside the car. After a while the pressure becomes so great that the window cracks, then brakes, releasing the built up pressure.

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11y ago
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2w ago

Rapid temperature changes between the hot exterior and cool interior of a car can create stress on the glass, leading to cracks or blowouts. The tightly closed windows restrict airflow and can trap heat inside, exacerbating this temperature difference. This, combined with any existing imperfections in the glass, can increase the likelihood of a blowout or crack occurring.

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Q: What causes a car with tightly closed windows occasionally have a window blow out or crack when exposed to the sun on a hot day?
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