The ratio between the number of human errors and the number of opportunities for human error. Synonyms: human failure probability and task failure probability.
Intended or unintended human action or inaction that produces an inappropriate result. Includes actions by designers, operators, engineers, or managers that may contribute to or result in accidents.
A material that is toxic, reactive, or flammable and is capable of causing a process safety incident if released. These materials are included in OSHA's PSM Standard, 29 CFR 1910.119.
The net difference in heat of formation of all reactants and of all products in an adiabatic system. The reaction is exothermic if heat is released (heat of reaction is negative), and endothermic if heat is absorbed by the reaction.
A chemical for which there is statistically significant evidence based on at least one study conducted in accordance with established scientific principles that acute or chronic health effects may occur in exposed employees. (OSHA 1994)
