Can | Heat ((hot)) Crack A Windshield

The windshield had expanded under the sun’s assault—every molecule of glass straining against its neighbor. Then she’d shocked it. A sudden, savage temperature difference. The inside shrank while the outside swelled. The glass couldn’t decide whether to stretch or squeeze. So it split.

She watched as the crack grew. Not fast, but deliberately, like a vine in a time-lapse video. It crawled two inches to the left, then jagged right toward the passenger side. A second crack branched off the first, then a third. Within a minute, the windshield looked like a frozen pond someone had thrown a rock into. can heat crack a windshield

She pulled into a dusty rest area just past the Arizona border. The temperature gauge on her dashboard read 109°F. She killed the engine, stepped out into the blast-furnace air, and walked toward the vending machines. The windshield, a slab of laminated glass now soaked in direct desert sun, sat there innocently. Not a crack, not a chip. Clean as a polished diamond. The inside shrank while the outside swelled

It wasn’t the heat that did it. Not alone. She watched as the crack grew