Argon gas replaces the air inside the glass unit. Since argon gas is heavier than air and is not in continuous motion like air, the transference of heat and cold (convection) is greatly reduced. Argon gas is inexpensive, nontoxic, non-reactive, clear, and odorless. In essence, the Argon gas provides extra insulation.

-see also:
"Argon gas" is in the UNSPSC Code "12142004"
  Argon gas Ar
Ref: 122222/2006-10-06

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Essence (Essence refers to a concentrated extract used as ...)
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