Oxygen, what the body needs
U.S. Air Force Airman 1st Class Richard Hubbard, 31st Logistics Readiness Squadron fixed facilities personnel, wears personal protective equipment to handle liquid oxygen, April 23, 2015, at Aviano Air Base, Italy. To handle the -238 degree liquid oxygen, Airmen must wear proper PPE, which includes safety glasses, face shields and long sleeve shirts. (U.S. Air Force photo by Senior Airman Matthew Lotz/Released)