Discussion
Scale in a boiler differs from sludge in that scale is
Answer: D
Correct answer: hard and adherent to the heating surface
Scale is a hard crystalline deposit bonded to the metal, formed where the salt crystallises directly on the hot surface. Sludge is a loose slurry that forms in the bulk of the water and can be removed by blowdown. The distinction matters entirely because of adherence: sludge is a nuisance, scale is a hazard.
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