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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site inert gas A gas that does not react with other substances, e.g. argon or krypton. Sealed between two sheets of glazing, an inert gas decreases the U-value (increase the R-value) of windows. Related category    • WINDOWS TOPICS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP