单词	calcium oxide
释义	calcium oxide noun : a caustic solid CaO that is white when pure and that is the chief constituent of lime Example Sentences Recent Examples on the Web Clinker is made when limestone, calcium carbonate, is taken out of the ground and heated to 2700 to 2800 degrees (1480 to 1540 degrees Celsius) to turn it into calcium oxide. Seth Borenstein, Anchorage Daily News, 23 June 2022 The residue contained sulfur and mercury, as well as magnesium, nitrates, phosphorus, calcium (possibly derived from calcium oxide, a component of Greek fire), lead, and iron. Jennifer Ouellette, Ars Technica, 3 May 2022 The plants also contain lime — calcium oxide — that made the glass more stable. Carolyn Wilke, Smithsonian Magazine, 24 Nov. 2021 Geochemcial analysis of the soil showed elevated levels of calcium oxide and manganese oxide, chemical signals consistent with those expected to be produced by the purification of a body. Brian Handwerk, Smithsonian Magazine, 5 May 2021 The gates, entrances and grounds of many farms were covered in snowy layers of calcium oxide, a disinfectant. Washington Post, 25 Sep. 2019 The primary ingredient in concrete is calcium oxide, which is taken from limestone (CaCO3)—and that leaves CO2 as a byproduct. Scott K. Johnson, Ars Technica, 17 Sep. 2019 There the calcium carbonate is heated to 900°C to release pure carbon-dioxide gas ready for capture, and calcium oxide. The Economist, 7 June 2018 On top of the harling went several coats of limewash, a mixture of water and calcium oxide. David Kamp, Vanities, 22 Sep. 2017 See More Word History First Known Use 1859, in the meaning defined above
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