Other factors can significantly affect a tablet's temperature, as well. Asus's Transformer Prime, Apple's iPad 2, and the new iPad all have metal backs, which pull heat away from the internal components, whereas the Samsung Galaxy Tab 10.1 has a plastic back. All four tablets get warmer when their brightness is set to maximum. And all will get warmer still if they are sitting in a case or are parked on an insulating surface such as a blanket or your jeans. In one memorable past episode, a Transformer Prime got fry-an-egg hot when I left it inside a foam case with its screen on for an extended period.

If you're looking for some practical solutions to tablet heat problems, let good sense be your guide. Be aware that both a tablet's front and back surface can get warm, and try to avoid situations that might make them even warmer. If you do use your tablet to the point where it becomes uncomfortably warm, dial down the display's brightness for a while, or take a short break and give the tablet a chance to cool off a bit. Your eyes--and maybe even your lap--will thank you.