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Glass is called a 'supercooled liquid'. Justify using crystalline vs amorphous properties. Step 1: Glass has no ordered lattice — X-ray shows diffuse halos, not sharp spots. Step 2: It has no sharp melting point — softens gradually over a range. Step 3: It is isotropic — properties same in all directions. Step 4: Like a liquid frozen mid-disorder: particles locked but unordered. Old windows are thicker at the bottom — glass flows imperceptibly over centuries.