As boiler feed water temperature increases, impurities precipitate (fall out) and adhere to the hot metal surfaces of the boiler, forming ___________.
A) scale
B) ions
C) acid
D) hydrogen

Question

Quizplus · Accepted Answer

As the temperature of boiler feed water increases, impurities such as calcium and magnesium salts precipitate and form a hard, adherent layer known as scale on the boiler's hot metal surfaces.

As Boiler Feed Water Temperature Increases, Impurities Precipitate (Fall Out)