Which gas fills the protective cases around the U.S. Constitution?
Argon
The answer was Argon. Here's the why, the decoys, and the source trail.
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The modern display cases use argon, helping create an oxygen-poor environment that slows deterioration.
Modern display encasements for the U.S. founding documents use argon to maintain an oxygen-poor environment.
A good question makes the wrong answers feel close. Here is the clean read on the set.
- Helium - a decoy; it may live near the same topic, but it does not answer this exact clue.
- Nitrogen - a decoy; it may live near the same topic, but it does not answer this exact clue.
- Argon - correct answer.
- Oxygen - a decoy; it may live near the same topic, but it does not answer this exact clue.
Argon is the one to remember. The modern display cases use argon, helping create an oxygen-poor environment that slows deterioration. The documents are continuously monitored in their display cases.
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Sources: U.S. National Archives