mm Hg 2 : Millimeters (mm) of mercury (Hg). It is a common unit of measurement for the pressure exerted by gases such as air. Normal atmospheric pressure is 760 mm Hg
Canadian Centre for Occupational Health and Safety CCOHS, Material Safety Data Sheet MSDS - An Explanation of Common Terms, Ontario, Canada 1988 (Revised 1996). http://ccinfoweb.ccohs.ca/help/msds/msdstermse.htm l, (Common MSDS Terms Used in Occupn Hlth and Sfty - Canad) {20}
The Association of Petrochemicals Producers in Europe (APPE), The European petrochemical industry, Glossary of Terms on Chemical Safety for Use in IPCS Publications, van Nieuwenhuyse, Brussels 2006. http://www.petrochemistry.eu/glossary.html, (Petrochem Ind - Brit) {473}