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Difficulty: MediumDrawing Logical Conclusions

Museum preservation vaults store historic iron-gall ink manuscripts in sealed microclimate cases regulated with silica gel cassettes. Because iron-gall ink contains acidic iron sulfates that accelerate paper degradation as relative humidity rises above forty percent, curators maintain the internal humidity strictly between thirty-five and thirty-eight percent. However, if the humidity drops below thirty percent, the underlying parchment becomes brittle and prone to structural cracking during handling. A recently inspected display case showed sudden parchment fracturing across several folios despite the silica gel cassettes being fully active.

Based on the passage, what is the most logical conclusion regarding the condition inside the inspected display case?

  1. A
    The internal relative humidity exceeded forty percent, causing the ink to corrode the pages.
  2. The internal relative humidity fell below thirty percent.Answer
  3. C
    External chemical pollutants entered the vault through compromised enclosure seals.
  4. D
    Curators improperly handled the folios while swapping exhausted silica gel cassettes.

Answer

The internal relative humidity fell below thirty percent.
The passage establishes that parchment becomes brittle and fractures when relative humidity drops below thirty percent; therefore, observing sudden folio fracturing leads to the logical conclusion that internal humidity fell below that threshold.

Step-by-Step Solution

1
Identify the environmental thresholds and their specific effects from the text.
Humidity above forty percent accelerates acidic degradation, while humidity below thirty percent causes parchment brittleness and structural cracking.
Distinguishing between the two distinct damage mechanisms is required to interpret the symptoms.
2
Evaluate the observed physical damage in the inspected case.
The inspection identified sudden fracturing and cracking across several folios.
Matching the reported symptom to the defined cause allows for a sound deductive conclusion.
3
Deduce the microclimate failure based on the matching condition.
Because fracturing is the direct consequence of excessive dryness, the internal humidity must have dropped below thirty percent.
This conclusion is strictly supported by the conditional statements provided in the passage.

Key Concept

Drawing logical conclusions by matching observed outcomes to conditional environmental thresholds.
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Topics

Drawing Logical Conclusions

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