A 6,000-gallon liquid oxygen tank is surrounded by evaporated oxygen July 29, 2015, at Yokota Air Base, Japan. Liquid oxygen has a boiling point of -297 degrees Fahrenheit and is used as breathing oxygen for pilots flying over 10,000 feet. The graphic was created using Adobe Photoshop to turn the image into black and white and reintroduce its original red lettering. (U.S. Air Force graphic by Airman 1st Class Delano Scott/Released)
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