Why can cotton clothes keep a crease after being folded?
Show answer & explanation
Answer: Folding lets molecular connections settle into a new arrangement
Folding breaks the fibers into shorter pieces along the fold — An ordinary crease does not require cotton fibers to snap. The fibers can remain intact while their internal molecular connections rearrange, which is why ironing can remove many creases without repairing broken threads.
Folding permanently removes air from the cotton fibers — Lost air does not lock cotton into a crease. The lasting shape reflects changes within and between the bent fibers; adding air back does not smooth the fold.
Folding lets molecular connections settle into a new arrangement ✓ — Cotton’s cellulose chains can shift when the fabric bends, and hydrogen bonds can reform in the changed arrangement. Moisture helps those connections rearrange, so a fold can persist after the pressure is removed. Heat and moisture during ironing help the chains move again as the fabric is smoothed.
More Physics in Daily Life questions
- In a warm office that already reads 26 C, which change can make people feel cooler without lowering the thermostat?
- Why might 26 C feel acceptable in a breezy naturally ventilated summer building but too warm in a sealed winter office?
- On a warm, humid day, why can a 27 °C room feel worse once your skin is sweaty?
- Why can moving air make a 27 C room feel cooler without changing the thermometer?
- Why can a desk beside a cold window feel chilly even when the thermostat across the room still reads 22 C?
- Why might someone who just climbed stairs feel warm in a 22 C room while someone sitting in a T-shirt feels chilly?