Associate Safety Professional Practice Exam

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What is the upper flammable limit?

  1. The minimum temperature needed for ignition

  2. The maximum vapor concentration supporting combustion

  3. The lowest concentration at which a flame can propagate

  4. The concentration of oxygen needed for combustion

The correct answer is: The maximum vapor concentration supporting combustion

The upper flammable limit (UFL) refers to the maximum concentration of a vapor in the air that can support combustion. When the concentration of the flammable substance exceeds this upper limit, there is not enough oxygen present in the air to sustain combustion, making it impossible for a fire to ignite. Understanding the UFL is crucial for safety assessments and fire prevention strategies in environments where flammable substances are present. It helps in identifying safety thresholds where control measures need to be implemented to prevent the risk of fire or explosion. In contrast, the other options refer to different aspects of combustion and ignition. The minimum temperature needed for ignition relates to the ignition temperature, while the lowest concentration at which a flame can propagate deals with the lower flammable limit. The concentration of oxygen needed for combustion pertains to the role of oxygen in the combustion process but does not directly define the UFL.

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