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boron trichloride (BCl3) definition

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a colorless gas at room temperature and atmospheric pressure. Boron trichloride fumes in the presence of moist air and has a choking odor. This gas is used as a gas etchant of metals such as aluminum. It also is used in boron doping. [SEMI C3.33-87]

See also:

bolometer definition
block-level definition
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Bohr radius definition