| blowback [`blō´bak] CHEMICAL ENGINEERING 1. A continuous stream of liquid or gas bled through air lines from instruments and to the process line being monitored; prevents process fluid from backing up and contacting the instrument. 2. Reverse flow of fluid through a filter medium to remove caked solids. Also known as backwash. GRAPHIC ARTS To enlarge, or make an enlargement of, an image. MECHANICAL ENGINEERING See <<blowdown>> |