1. 
   QNH
   abbreviation: Altimeter setting which provides height above mean sea level
   Found op http://www.apscharts.com/abbrev.html
   
   
2. 
   QNH
   Regional pressure setting corrected at sea level - adjusting an altimeter to this setting should indicate height above sea level. (nb - to find out height above ground level you can use the map and work out a spot height or an global positioning system (a machine that uses satellites to measure posi...
   Found op http://www.bized.co.uk/virtual/cb/glossary/glossary3.htm
   
   
3. 
   QNH
   QNH is one of the many Q codes. It is defined as, "barometric pressure adjusted to sea level." It is a pressure setting used by pilots, air traffic control (ATC), and low frequency weather beacons to refer to the barometric setting which, when set on an aircraft`s altimeter, will cause the altimete...
   Found op http://en.wikipedia.org/wiki/QNH
   
   
4. 
   Qnh
   QNH is an abbreviation for sea level pressure
   Found op http://www.probertencyclopaedia.com/N17.HTM
   
   
5. 
   QNH
   Air pressure referred to mean sea level, given in hPa and mmHg
   Found op http://www.f-16.net/glossary-Q.html
   
   

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