单词	pyrophosphoric acid
释义	pyrophosphoric acid /ˌpʌɪrə(ʊ)fɒsˈfɒrɪk / noun [mass noun] Chemistry A glassy solid obtained by heating phosphoric acid. A tetrabasic acid; chemical formula: H4P2O7. Pyrophosphoric acid is colorless, odorless, hygroscopic and is soluble in water.
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