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 ...

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 ...

Hydrogen is a highly flammable and explosive gas, and hydrogen balloons can easily ignite or explode when exposed to open flames or static electricity. The use and sale of hydrogen balloons in ...