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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 chimney effect The tendency of heated air or gas to rise in a duct or other vertical passage, such as in a chimney, small enclosure, or building, due to its lower density compared to the surrounding air or gas. Related category       • FIRES AND FIREPLACES Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP