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MEBRO
07/03/26 · 9:11 AM UTC · 12 SOURCES
“The use of cold water in an ethanol-gasoline separation test causes measurement errors due to liquid volume contraction.”
HIGH CONFIDENCE
TL;DR ·Mixing ethanol and water causes volume contraction and temperature-dependent density changes that skew measurements.
Testing gasoline for ethanol content involves adding water to a sample to induce phase separation, where the ethanol leaves the gasoline and joins the water . This test relies on measuring the change in volume of the aqueous layer to deduce the alcohol percentage . However, it is a documented chemical fact that mixing ethanol and water results in liquid volume contraction; for example, mixing 250 mL of each results in only approximately 480 mL of solution rather than 500 mL . Furthermore, temperature significantly impacts these measurements because densities change significantly as temperatures rise or fall . Under cold conditions, gasoline density increases while the phase-separated layer density changes, leading to potential inaccuracies if the nominal temperature of 15°C is not maintained or corrected for . While some sources suggest that measurement errors in standard graduated vessels might overshadow the contraction effect, the physical phenomenon of volume loss and temperature-induced density variance are established factors that cause measurement errors in precise fuel quality testing .
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