How to use vacuum pump

Creating a vacuum during a system requires moving all molecules of gas out of the system. Molecules will only move if there's a difference in pressure between two regions. The region that has the smaller number of molecules are going to be the low region and therefore the area with more molecules are going to be considered the high . A device which will induce pressure difference between two regions of space is taken into account a pump. In a certain system, the pump that makes a vacuum is taken into account a air pump.