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31. Traditionally, iron oxide is converted to the metal in a blast furnace.

32. Figure 2, for instance, shows the breaking strains of whiskers of two very different substances, silicon and zinc oxide.

33. Flotation is important in separating particles of tin oxide less than about 40 micrometres in diameter.

34. Increasing atmospheric levels of nitrous oxide currently stand at about eight percent above pre-industrial levels.

35. A model system relates energy consumption to emissions of sulphur and nitrogen oxide emissions.

36. Nitrogen oxide Forty percent of nitrogen oxide emissions in Britain come from vehicles.

37. Ellingham Diagrams Ellingham diagrams show at a glance which oxide will be reduced.

38. At a given temperature, the oxide with the higher line will be the one that is reduced.

39. He looked exhausted and his hands were black with silver oxide from helping his brothers count the takings.

40. One of the most popular has been carnelian, which owes its reddish colour to the presence of iron oxide.

41. Loperamide oxide increased the rate of gastric emptying but slowed both small intestinal and whole gut transit.

42. The white glass also contained 12.0010 of lead oxide: this would have made it softer and therefore easier to cut.

43. Oxyhaemoglobin, a scavenger of nitric oxide, also abolished the relaxations but methaemoglobin had no such effect.

44. Any vulnerable parts should be treated with zinc oxide plaster, so the skin hardens overnight.

45. Nitrogen oxide emissions from vehicles are rising every year because of the huge growth in the number of cars.

46. Once produced, nitrous oxide remains in the atmosphere for about 150 years.

47. Rust, iron oxide, is weak mechanically although its chemical bonds are strong.

48. Another very unusual feature of these glasses is that they contain very low calcium oxide levels-c. 1 %.

49. In nephrite it occurs exclusively as ferrous and in jadeite as ferric oxide.

50. Bacteria then work on the nitrates converting them firstly to nitrous oxide and then to free nitrogen gas.Sentencedict.com

51. When low levels of lead oxide are present there can be a problem of dissolving the copper in the glass.

52. It would also reduce sulphur dioxide and nitrous oxide emissions, which cause acid rain, by 42,000 tonnes.

53. Newer electrodes using transparent indium-tin oxide as conductor material have increased the electrode density from 36 to 64 per square millimeter.

54. The addition of iron oxide produced a darker brown colour in the glaze under reducing conditions.

55. The waste contains tin oxide, in proportions too minute for last century's miners to recover.

56. Traffic now accounts for 51 percent of total nitrogen oxide emissions, compared to 31 percent in 1980.

57. Moreover, a strong presence of ferrous oxide in the walls gives them a red color.

58. The chemicals have to be carefully selected so that they affect only the tin oxide and nothing else.

59. A can of whipped cream uses nitrous oxide, an anesthetic, as a propellant.

60. The cocktail of greenhouse gases includes chlorofluorocarbons, methane, nitrous oxide and carbon dioxide.