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Saturated steam under pressure is normally used at

  • A.121 degrees Celsius and 15 pounds per square inch
  • B.100 degrees Celsius at ordinary atmospheric pressure
  • C.160 degrees Celsius and 30 pounds per square inch
  • D.80 degrees Celsius and 5 pounds per square inch

Answer: A

Raising the pressure about 15 pounds per square inch above atmospheric lets saturated steam reach 121 degrees, well above the 100 degrees available at open-air boiling. The holding time is at least 15 minutes, and longer for wrapped or dense loads, which is why 30 minutes is often specified.

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