Some substances are more toxic than others. The toxicity of a substance is described by the types of effects it causes and its potency. 1  Types of Effects: Different chemicals cause different effects.
I think I remember reading that injured means bruises and lascerations, seriously injured meant hospital but not life threatening, critically injured meant hospital ICU time and fatally injured meant injuries leading to dying sometime later.
Here are the definitions I use, and OSHAâs Hazard: Any facility, location, equipment, tool, job, task, or action that presents a potential of serious injury or death to any employee. This is the OSHA view. Serious injuries are those that result in time loss (beyond the three day grace period) and/or hospitalization beyond an emergency room visit. OSHA: A hazard is the potential for harm. In practical terms, a hazard often is associated with a condition or activity that, if left uncontrolled, can result in an injury or illness. Risk: It is related to Hazard, it is the potential of harm or loss (generally economic) and its impact to the company or individual from a potential hazard.