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.
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。
2
2 SEC Because heat is no longer being transferred to the secondary loop, water pressure and water temperature in the primary loop rise. This is normal and no cause for concern.
2秒由于热量不能传到二次回路，主回路中的水压和水温上升，这很平常，不必担心。
3
The high-pressure liquid refrigerant through the expansion valve, because the expansion valve throttling pressure drop, the refrigerant into normaltemperature low pressure liquid.