A seed crystal can be dropped into a saturated solution of sodium acetate. The solution will suddenly crystallize and turn to solid. Alternately, the solution may be slowly poured out onto a seed ...

A reusable hot pack made of a supersaturated sodium acetate solution that crystallizes spontaneously once triggered by a metal piece releases heat. A balloon filled with hydrogen gas also releases ...

As the winter months beckon, people around the country (up north at least) will be stocking up on hand warmers—or grabbing them from the counter on those bitter cold days. These handy devices use a ...