A molecular drag pump is a type of vacuum pump designed to achieve very low pressures (high vacuum conditions) by utilizing molecular flow principles. Instead of relying on mechanical means to compress gases, it operates based on the interactions between gas molecules and a moving surface. ### Key Principles of Molecular Drag Pumps: 1. **Molecular Flow**: At extremely low pressures, the mean free path of gas molecules is much larger than the dimensions of the pump.
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