氮气膨胀剂在固井防气窜中起着重要的作用。
Nitrogen swelling agent is vital for controlling gas channelling during cementing.
胎压升高主要由于胎内气体膨胀，所以，夏季给车胎充干燥氮气是不错的选择。
Mainly because of rising inflation pressure gas inside the womb, so, the summer to tire filling dry nitrogen is right choice.
氮气是惰性气体，膨胀系数低，不轻易随环境温度上升而上升，可较长时间维持正常胎压，大大降低爆胎几率。
Nitrogen is the inert gases, low expansion coefficient, not easily with the environmental temperature rise for a long time, can maintain normal tire pressure, greatly reduce the flat tire.
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