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Off-Gassing

The production of gases from the chemical deterioration of a substance over time, and the release of gases from materials into the air. https://healthymaterialslab.org/tool-guides/hml-resources

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Octave

Interval between two sounds having a basic frequency ratio of two. The formula is 2n times the frequency, where n is the desired octave interval. The octave band frequency given in sound test results is usually the band center frequency, thus the 1000 Hz octave band encompasses frequencies from 707 Hz to 1414 Hz (n = ± 1/2). The 1000 Hz one-third-octave band encompasses frequencies from 891 Hz to 1122 Hz (n = ± 1/6).

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Oakum

Loose hemp or jute fiber that's impregnated with tar or pitch and used to caulk large seams or for packing plumbing pipe joints A caulking material made from hemp fibers treated with tar.

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Optimization

The use of human health, environmental, and other product information by project teams to select preferable materials and products, and by manufacturers to improve materials and products https://healthymaterialslab.org/tool-guides/hml-resources

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