Discussion
Assertion (A): Fine powders sinter more readily than coarse ones of the same material.
Reason (R): A finer powder has more surface area and therefore a greater driving force per unit mass.
Answer: B
Both are true and the reason gives the thermodynamics: the energy available to be released scales with the surface area, and the diffusion distances are shorter as well, so both the driving force and the kinetics favour fine powder.
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