AFFF density relative to hydrocarbon fuels.

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Multiple Choice

AFFF density relative to hydrocarbon fuels.

Explanation:
Density is about how heavy a substance is for a given amount of space. AFFF concentrates are water-based and have a density around 1.0 g/cm3 (roughly the density of water). Hydrocarbon fuels, such as gasoline, diesel, and jet fuel, are lighter than water, typically in the 0.65–0.90 g/cm3 range depending on the fuel. Because AFFF is, on average, denser than these fuels, the statement that AFFF density is higher than hydrocarbon fuels is true. This density difference helps explain how the foam interacts with the fuel surface and why AFFF forms a protective blanket on hydrocarbon fires.

Density is about how heavy a substance is for a given amount of space. AFFF concentrates are water-based and have a density around 1.0 g/cm3 (roughly the density of water). Hydrocarbon fuels, such as gasoline, diesel, and jet fuel, are lighter than water, typically in the 0.65–0.90 g/cm3 range depending on the fuel. Because AFFF is, on average, denser than these fuels, the statement that AFFF density is higher than hydrocarbon fuels is true. This density difference helps explain how the foam interacts with the fuel surface and why AFFF forms a protective blanket on hydrocarbon fires.

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