Which fuel measuring method allows for the detection of density changes over temperature variations?

The correct answer is poundage weight measurement. This method is particularly effective at detecting changes in density that occur due to temperature variations. In aviation fuel systems, fuel density can fluctuate significantly with temperature changes, which can impact the calculation of fuel quantity and performance.

Weight measurement directly accounts for the mass of the fuel, allowing for an accurate assessment despite changes in temperature. Since density is defined as mass per unit volume, any variation in temperature can lead to changes in density. By measuring the weight of the fuel, one can infer the effective density at that temperature. This information becomes crucial for ensuring proper fuel management and calculations in aircraft operations.

In contrast, metric volume measurement may not account for density changes since it focuses solely on volume, and as liquid fuel expands or contracts with temperature, the volume may indicate an inaccurate representation of the actual mass of the fuel available. Cubic measurements may also provide volume data without necessarily addressing the accompanying changes in density. Flow rate measuring allows for monitoring the speed of fuel movement but does not provide information on how density changes may affect the volume of fuel due to temperature shifts. Therefore, poundage weight measurement stands out as the best method for detecting density changes due to temperature variations.