Staff Sgt. Chris Bates, 455th ELRS fuels laboratory NCO in charge, uses a hydrometer to test a sample of aircraft fuel on Bagram Airfield, Afghanistan, Feb. 21, 2013. This test is done every day to measure the net amount of fuel available, which can be affected by expansion or contraction due to weather conditions. (U.S. Air Force photo/Staff Sgt. David Dobrydney)
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