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.
One of the most important types of reactions studied using calorimetry is combustion. (For more information, see Section 3.2) A compound, usually an organic compound, is allowed to react completely with excess oxygen. Equation 5.15 is an example of such a reaction. Combustion reactions are most conveniently studied using a bomb calorimeter, a device shown schematically in Figure 5.16. The substance to be studied is placed in a small cup within a sealed vessel called a bomb.