An oxide containing five atoms of oxygen in its molecule or empirical formula.
‘Glass-forming substances are usually silica, boric oxide, phosphorous pentoxide, or feldspars.’
‘In one method, naphthalene is oxidized with vanadium pentoxide to give phthalic anhydride.’
‘The thin covering is composed of alternating layers of silicon dioxide and tantalum pentoxide.’
‘The procedure was repeated three times and the filtrate was dried in an oven at 100°C and cooled over phosphorus pentoxide.’
‘It would also involve the re-tubing of two primary wet electrostatic precipitators, the pre-heater exchanger and replacement of 6,000 litres of vanadium pentoxide catalyst in the converter.’
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