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.
They are typically classified by what happens during the reaction to the reactants as well as the type of product that is formed as a result of the reaction. A combustion reaction is a reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light.