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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The results show that nitrogen solubility increases with increasing of nitrogen pressure and decreasing of temperature.

实验发现，氮分压越大其氮的溶解度越大，而温度越高则氮的溶解度越小。

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Then introduced the connections of the recycling nitrogen pressure controlled process and PID controller and frequency inverter .

然后介绍回收氮气压力的控制过程及PID控制器与变频器的联接方式。

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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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