Oxygen free nitrogen pressure testing is now widely recommended.

现在广泛使用的是无氧氮气压力检测。

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With increasing of nitrogen pressure, the cooling capacity of nitrogen, the cooling velocity and hardness of the workpieces after quenching are improved.

随着氮气压力的提高，气体的冷却能力、工件的冷却速度、工件淬火后的硬度等都得到了不同程度的提高。

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The effects of initial factors such as the content of diluent, nitrogen pressure and the porosity of compacts on the conversion and relative density of products were discussed in detail.

研究了稀释剂含量、氮气压力、毛坯初始空隙率等初始条件对产物转化率和致密度的影响。

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We variously talked about fitting bicycle valves to the caps and pumping them up, building a hyperbaric chamber to fill the bottles under pressure and finally liquid nitrogen.

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Then in the early 20th Century, German chemist Fritz Haber invented a high temperature-high pressure technique to convert atmospheric nitrogen into ammonia.

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