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Specific surface area of a ceramic powder is commonly measured by

  • A.gas adsorption using the BET method
  • B.weighing a known volume of the powder
  • C.measuring the setting time of a paste
  • D.counting the particles under a microscope

Answer: A

Nitrogen adsorbed as a monolayer at low temperature gives the accessible area, including that of pores and of fine features. It complements a size distribution rather than duplicating it, since two powders of the same size can differ in area.

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