The theoretical formula about vacuity in vacuumtube and pore-water pressure at the observation point was obtained in this paper by using equation of gas state and equilibrium equation.
根据气体状态方程和平衡方程，推导出在某点真空表反映的真空度值与孔压计反映的孔压差的理论关系式。
2
In design of a vacuum system, generally it concerns distinguishing the regions of gas flow, the conductance of tube, the pumping speed and the pressure of system etc.
在真空系统的设计中，一般涉及到流态判别、流导、泵的抽速和系统的压力等参数。
3
Thermal behavior of vacuum concentric tube annulus is a process involving combined heat transfer mode, in which the thermal conduction of low pressure gas plays an important role.