What is perfect vacuum in HG?

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Tags

1. #rough
2. #vacuum
3. #method
4. #different
5. #standard
6. #inches
7. #measure
8. #where
9. #gauge
10. #measured
11. #which
12. #pressure
13. #atmospheric
14. #perfect
15. #scale
16. #common
17. #mercury
18. #starts