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Dry heat is less efficient than moist heat at the same temperature because

  • A.dry heat is absorbed only by bacterial spores
  • B.water greatly lowers the temperature at which proteins coagulate
  • C.dry air carries more heat energy to a surface than steam does
  • D.dry heat cannot penetrate any wrapping material

Answer: B

Moisture is what makes protein coagulation happen at a modest temperature, so steam at 121 degrees achieves in minutes what dry air needs 160 degrees and hours to do. Steam also carries far more heat to the surface as it condenses.

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