Firefighter Aptitude and Character Test (FACT) Practice Test

Question: 1 / 400

What is the vapor density of acetone?

1.50

1.80

2.00

The vapor density of a substance is a measure of how heavy its vapors are compared to an equal volume of air. For acetone, the correct vapor density is approximately 2.00. This means that acetone vapors are twice as dense as air, which is why it can linger in lower areas in the presence of air and is considered a potentially hazardous material when it evaporates.

Understanding the vapor density is crucial for safety precautions in firefighting and hazardous material management. It helps firefighters predict the behavior of vapors in the environment and establish safe zones for breathing apparatus use, and ensures proper ventilation in enclosed spaces where flammable vapors may accumulate.

The other options, 1.50, 1.80, and 2.50, do not accurately represent the vapor density of acetone and could lead to misunderstandings regarding its physical properties and safety protocols.

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2.50

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