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Originally Posted by the_marq
Uhh, no they aren't.
Touch pads work on the basis of capacitance (electrical differential).
If it was heat and pressure you could operate a touch pad with a fresh warm McDonald's french fry (you can't, I've tried).
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There are some "touch-sensitive" devices that work on heat. The elevator in my college dorm had heat-sensitive buttons; if you were careful, you could select a floor by hovering your finger over the button rather than touching it. The big problem was that on a hot, humid day, every single button would be selected. And those were the days that you
really didn't want to have to use the stairs...
(I'm not contradicting
the-marq, just filling out the discussion.)