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State whether the following is true or false.
Entrained air and entrapped air are the same thing.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: C

Entrained air consists of deliberately introduced fine bubbles of controlled size, whereas entrapped air is larger voids left by incomplete compaction. One is designed for and the other is a defect. Compaction removes the second but cannot create the first.

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