04/08/13 - 8:49am
In your hand it looks like any other ordinary metal spring, right?
That little spring is made of memory metal — Nitinol to be precise — and it can do amazing things, explains Alan Warwick.
You stretch the spring out between your hands, and Warwick holds a hairdryer beneath it.
“See how much force there is?” he says.
That’s astonishing, you think. You try, but the little spring in your fingers pulls you hands together as the hairdryer heats it.
“There can be a lot of force. Each molecule has a bit of strength,” he says.