How to actuate nitinol

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Nitinol changes phases at a specific series of temperatures. 

So, anything you do to change the temperature will actuate nitinol. 

The most obvious of these is to apply direct heat.  you can use a flame,

hot water, sunlight, or the daily change in air temperature—whatever is

convenient for you.  Another option is to use electricity to heat the wire

to its transition temperature to initiate the transformation.