The original Declaration of Independence is preserved in a bulletproof case filled with which gas?
Neon
Argon
Helium
Nitrogen
The original Declaration of Independence is preserved in a bulletproof case filled with argon gas. This preservation method is employed to protect the delicate and historic document from the damaging effects of environmental factors such as light, humidity, and pollutants. Argon is an inert gas, meaning it does not react with other substances, which helps to maintain the integrity of the paper and ink. By keeping the Declaration in an argon-filled case, conservators ensure that it remains in a stable and controlled environment, significantly reducing the risk of deterioration over time.
Correct Answer: Argon