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September 2024

Reactivity

The relative tendency of a substance to undergo chemical reaction (low, medium, or high).

Reactive Substance/Material

Substance or material which enters into a chemical reaction with other stable or unstable material.

Reactive Groups

Categories of chemicals that react in similar ways, often because they are similar in their chemical structure. (NOAA 2002)

Reactive Chemical

A substance that can pose a chemical reactivity hazard by readily oxidizing in air without an ignition source (spontaneously combustible or peroxide forming), initiating or promoting combustion in other materials (oxidizer), reacting with water, or self-reacting (polymerizing, decomposing or...

Reaction Kinetics

The complex of data (thermodynamic and kinetic), that determine a reaction.

Reaction Induction Time (RIT)

The time a chemical compound or mixture may be held under isothermal conditions until it exhibits a specific exothermic reaction. (ASTM E 1445)

Reaction

Any transformation of material accompanied by a change of enthalpy which may be endothermic or exothermic. (ASTM E 1445)

Reactants

Chemicals that are converted into the required products during the reaction process.

Raw Data

The original records from which reliability data is extracted; the facility records of equipment failure, repair, outage, and exposure hours or demands which require analysis and encoding in order to be placed into data elements.

Rate of Reaction

The rate at which the conversion of reactants takes place. The rate of reaction (r) is a function of concentrations (F(c)) and the reaction rate constant (k): r = koF(cA,cB,...,cX). The heat (q) produced by a reaction is a linear function of the rate of reaction which makes the rate of reaction a...

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