What does specific gravity tell you in fuel testing?

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Multiple Choice

What does specific gravity tell you in fuel testing?

Explanation:
Specific gravity measures how dense a fuel is compared with water. It’s the ratio of the fuel’s density to the density of water at a standard temperature. This tells you, in a single number, how heavy or light the fuel is relative to water, which helps confirm the fuel type and quality. Why this helps for grading and purity: different fuels have characteristic densities, so the measured specific gravity should match the expected range for a given grade. If the value is off, it can indicate adulteration or contamination, such as mixing in another liquid with a different density (for example, water or an unwanted hydrocarbon). Temperature affects density, so measurements are corrected to a reference temperature to be meaningful. Color, volatility, and lubricity require different tests, so specific gravity specifically targets density-related identification and detection of adulteration.

Specific gravity measures how dense a fuel is compared with water. It’s the ratio of the fuel’s density to the density of water at a standard temperature. This tells you, in a single number, how heavy or light the fuel is relative to water, which helps confirm the fuel type and quality.

Why this helps for grading and purity: different fuels have characteristic densities, so the measured specific gravity should match the expected range for a given grade. If the value is off, it can indicate adulteration or contamination, such as mixing in another liquid with a different density (for example, water or an unwanted hydrocarbon). Temperature affects density, so measurements are corrected to a reference temperature to be meaningful.

Color, volatility, and lubricity require different tests, so specific gravity specifically targets density-related identification and detection of adulteration.

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