The work “hazard" is in common use in the English language and it must be defined here to show the context in which it is used hereafter.


A physical situation with a potential for human injury, dam­age to property, damage to the environment or some combi­nation of these.

It can be seen from the definition that three distinct types of ef­fect are considered but in some cases one hazard may lead to others. Fire, for example, can be a serious health hazard.

A hazardous substance:

A substance, which, by virtue of its chemical properties, constitutes a hazard.

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