Question:medium

State the number of grains per square inch at a magnification of 100X for ASTM grain size number 8

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ASTM formula: $N = 2^{n-1}$. For $n=8$, just remember $2^7 = 128$.
Updated On: Jul 4, 2026
  • 64
  • 128
  • 256
  • 512
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The Correct Option is B

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