Ironing works by loosening the bonds between the long-chain polymer molecules in the fibers of the material. While the molecules are hot, the fibers are straightened by the weight of the iron, and they hold their new shape as they cool.
No doubt, ironing occupies an important place in our society. Go to a job interview without a pressed shirt if you want a practical demonstration.
The Magical World of Electric Irons.
(via Grow-A-Brain)
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