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A potentially explosive atmosphere exists when a mixture of air, gases, vapours, mists or dust combines in a way that can ignite under certain operating conditions. Hydrogen is the special gas in this context. Those who have knowledge of the properties and flammability of hydrogen will recognize that hazards due to explosive atmospheres must be assessed more and more frequently as the element is utilized, and, if necessary, appropriate protective measures must be taken. In this kind of atmosphere, special attentio...

An attack with a "improvised" explosive device (IED) is when someone uses a bomb and/or destructive device to cause damage, render someone helpless, harass, or divert attention. Terrorists, criminals, vandals, suicide bombers, and rebels all utilize IEDs. IEDs can take many different shapes because they are improvised; they can be as simple as a pipe bomb or as complex as a sophisticated weapon that can inflict significant damage and casualties. IEDs can be transported or carried in a car; they can also be deliver...