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Density is one of the most prevalent physical properties used to classify and characterize petroleum products. Used in conjunction with the specific-industry API Gravity scale, its accurate and precise measurement is necessary for converting the measured volumes into volumes at reference temperatures (15°C and 60°F). This test possesses the means for measuring the gravity of aviation fuel with a hydrometer. A significant change in gravity may indicate contamination by another product and may require further testing.

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