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NOTE: This is an unformatted excerpt from our online fire protection training library.

Identifying Materials & Equipment

Characteristics

Liquids with low flash points are said to be highly volatile. Highly volatile liquids form vapors readily at normal ambient temperatures. Also, when a liquid is above its boiling point it will create vapor very rapidly. Another important characteristic of a liquid is the vapor density. The vapor density is a comparison of the weight of a vapor as compared to air. Most flammable and combustible liquids are heavier than air (vapor density over 1.0), so they will tend to sink to the floor or grade. The rate of vapor release and the density are used to predict how a vapor will spread and dissipate when it forms and are two factors that determine the size and location of a classified area around a vapor source.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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