1. 
   Pressure Gradient
   This is the force responsible for starting a parcel of air moving. Air moving from high to low pressure.
   Found op http://www.bized.co.uk/virtual/cb/glossary/glossary3.htm
   
   
2. 
   pressure gradient
   1. a scale of pressure differences in which there is a uniform variation of pressure from point to point. For example, the pressure gradient of a column of water is about 0.433 pounds per square inch per foot (9.794 kilopascals per meter) of vertical elevation. The normal pressure gradient in a fo...
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
3. 
   Pressure Gradient
   The rate of change of pressure in an imaginary horizontal plane running between areas of high and low pressure on a weather map.
   Found op http://www.aeroplanemonthly.com/glossary/
   
   
4. 
   Pressure gradient
   In atmospheric sciences (meteorology, climatology and related fields), the pressure gradient (typically of air, more generally of any fluid) is a physical quantity that describes in which direction and at what rate the pressure changes the most rapidly around a particular location. The pressure gra...
   Found op http://en.wikipedia.org/wiki/Pressure_gradient
   
   
5. 
   PRESSURE GRADIENT
   The amount of pressure change that occurs over a fixed distance at a fixed altitude.
   Found op http://www.weather.com/glossary/p.html
   
   

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