Flocculation, in the field of chemistry, is a process wherein colloids come out of suspension in the form of floc or flake; either spontaneously or due to the addition of a clarifying agent.
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<br /><b><br /></b><br /><b>Rail gauge</b> is the distance between the inner sides of the heads of the two load bearing parallel rails that make up a single railway line. Sixty percent of the world's railways use a standard gauge of 1,435 mm (4 ft 8+1â2 in)