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    				| 1. | Contrast and compare physical chemical and Biological Hazard on the basis of •elements of hazard | 
| Answer» Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original substance is called the FUEL, and the source of oxygen is called the oxidizer. The fuel can be a solid, liquid, or gas, although for AIRPLANE propulsion the fuel is usually a liquid. | |