A panic attack is an exaggeration of your bodyâs normal response to fear, stress or excitement. It is the rapid build-up of overwhelming physical sensations, such as: 1  a pounding heartbeat. 2  feeling faint. 3  sweating. 4  nausea (feeling sick).
Since four elements must be present for the combustion process to occur (fuel, heat, an oxidizing agent, and a chemical chain reaction), a fire can be extinguished by removing any one of these four elements.
Combustion combines energetic molecules with oxygen to produce carbon dioxide and water. For example, the combustion reaction of propane, found in gas grills and some fireplaces, is: C 3 H 8 + 5O 2 â 4H 2 O + 3CO 2 + energy. More About Combustion Reactions.