A vapor density greater than 1 indicates the vapor is heavier than air. Which statement correctly describes this relationship?

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Multiple Choice

A vapor density greater than 1 indicates the vapor is heavier than air. Which statement correctly describes this relationship?

Vapor density compares how heavy a vapor is relative to air. If the vapor density is greater than 1, the vapor is heavier than air and will tend to settle in low spots, pooling near the ground or in depressions. This behavior explains why heavier-than-air vapors can accumulate along floors and flow along the ground to reach ignition sources or confined spaces. In contrast, vapors with density less than 1 will rise, and those with density about equal to 1 will mix with the surrounding air. So when the vapor density exceeds 1, describing it as heavier than air is the accurate relationship. For reference, fuels like propane have heavier-than-air vapors, while methane has lighter-than-air vapors.

Vapor density compares how heavy a vapor is relative to air. If the vapor density is greater than 1, the vapor is heavier than air and will tend to settle in low spots, pooling near the ground or in depressions. This behavior explains why heavier-than-air vapors can accumulate along floors and flow along the ground to reach ignition sources or confined spaces. In contrast, vapors with density less than 1 will rise, and those with density about equal to 1 will mix with the surrounding air. So when the vapor density exceeds 1, describing it as heavier than air is the accurate relationship. For reference, fuels like propane have heavier-than-air vapors, while methane has lighter-than-air vapors.

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