Pork cooked at a steady temperature has skin that’s crisp but
smooth, with little surface area.
See how, despite a few wrinkles here and there, it’s
relatively smooth? Well, smooth objects have relatively low
surface area given a particular volume, while wrinkled,
bubbled, crinkly, curvy objects have a relatively high
surface area given the same volume. And when it comes to
texture, more surface area = more crunch. It’s the same