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  1. Physicists call it the coefficient of linear expansion. What it means is that stuff gets bigger when it heats up a bit. Highways buckle and hardwood floors take on moisture, grow and buckle too from the expansion. When tempered glass is squeezed from the side or hit on the side, it’ll explode. Chances are that moisture got into the frame of the shower door, expanded the absorbent material surrounding it enough to create just enough pressure inside the rigid aluminum frame which was cooler, perhaps from the evaporation and the A/C (kids were wearing T-shirts…summer) and these shrinking frame and expanding glass factors squeezed hard enough…kablooey!

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