Context: The lowest pressure that can be attained in a system is also dependent on many things other than the nature of the pumps. Multiple pumps may be connected in series, called stages, to achieve higher vacuums. The choice of seals, chamber geometry, materials, and pump-down procedures will all have an impact. Collectively, these are called vacuum technique. And sometimes, the final pressure is not the only relevant characteristic. Pumping systems differ in oil contamination, vibration, preferential pumping of certain gases, pump-down speeds, intermittent duty cycle, reliability, or tolerance to high leakage rates.

Question: When multiple pumps are connected in series to produce higher vacuum it is called what?
Answer: stages

Question: The choice of seals, or chamber geometry ,for example impact a pump. Together these are options are called what?
Answer: vacuum technique

Question: What are two other relevant characteristics of a pumping system along with final pressure?
Answer: oil contamination, vibration

Question: How can chamber geometry be connected?
Answer: Unanswerable

Question: What can oil contamination be dependent on instead of pump nature?
Answer: Unanswerable

Question: How do leakage rates usually happen?
Answer: Unanswerable

Question: What do certain gases usually help a pump achieve?
Answer: Unanswerable

Question: What are two other characteristics of a seal?
Answer: Unanswerable