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3D3DArgon-filled double-pane window.
Inexpensive insulated double-page windows are often filled with argon gas because it's cheap and helps a bit to increase the insulating properties of the window. It leaks out after a few years.
Source: Hardware Store
Contributor: Theodore Gray
Acquired: 28 February, 2009
Text Updated: 1 March, 2009
Price: $30
Size: 12"
Purity: 80%