They are kept in the inert gas argon with a slight humidity to keep the documents flexible.
Argon gas and some humidity to keep the document from drying out.
The Declaration is actually kept in argon gas, not helium, with a little humidity to keep the document from becoming brittle. Argon gas is an inert gas and will not react chemically with any other chemicals in the ink or parchment of the document itself to harm it.
Advantages of tear gas would have to be , it splits up large riot groups. Used by police.
Gas prices in 1980 averaged about 86 cents per liter. This was a very high price to pay back then.
Mustard Gas
hydrogen
Argon gas and some humidity to keep the document from drying out.
The encasement for the Declaration of Independence contains a mixture of argon gas and filtered dry air to help preserve the document. Argon gas is commonly used in museum settings as it helps to inhibit the growth of mold and halts the degradation of the ink and parchment.
It is kept in a sealed case filled with argon gas at the National Archives Building in Washington, DC
Potential energy is stored in natural gas.
Potential energy is stored in natural gas.
Gas is stored in the Magma chamber at the bottom of the volcano, along with the magma.
Gas cylinder.
Gas cylinder.
In a gas bottle, in a gas field or in a gasometer.
According to The Blaze, "After undergoing careful inspection for further erosion in 2003, the document was resealed in a titanium casement filled with inert argon gas."
In a gas bottle, in a gas field or in a gasometer.