What causes baking sheets to warp?

Online Answer
When cold water comes into sudden contact with one side of a hot pan, the atoms of the pan rapidly and unevenly contract, which causes warping. When a pan cools down more gradually, it's less likely to warp because its atoms contract evenly across the entire pan. ... Placing a hot pan in cooler water can warp the pan..
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When cold water comes into sudden contact with one side of a hot pan, the atoms of the pan rapidly and unevenly contract, which causes warping. When a pan cools down more gradually, it's less likely to warp because its atoms contract evenly across the entire pan. ... Placing a hot pan in cooler water can warp the pan..