Posted by pumper on September 17, 1998 at 07:32:16:
In Reply to: Re: reaced the dreaded 10 in HG vacuum posted by Explain Please on September 15, 1998 at 12:32:14:
10 inches of Mercury (HG) is the vacuum required to pull mercury up a glass column a total of 10 inches. the other measurement is in centimeters of Mercury which is a higher number by a factor of 2.54, i.e. 10 inches of HG is equivalent to 25.4 centimeters.
If you are using 10 inches of mercury you are eventually going to hurt your self. I would not recommend going over 4-5 inches of HG. If you do the damage will eventually occur.
Happy pumping. (Note: If I have misstated the above then someone needs to correct me. Chemistry 202 was a number of years ago.