Infants; Intravenous catheter system; Sealing liquid; Sealing effect; Retention time.
婴幼儿；静脉留置针；封管液；封管效果；留置时间。
During the pumping cycle the gas is in intimate contact with the sealing liquid and compression is nearly isothermal.
在抽运周期内，气体会与密封液和几乎等温的压缩气体紧密接触。
Based on the molecular motion characteristics of liquid in low temperature, the paper presents the equations for specific pressure for sealing liquid in low temperature.
本文根据液体在低温状态下，分子运动的特性，提出了低温密封液体的比压计算公式。
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