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===API specific gravity===
 
===API specific gravity===
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[[file:petroleum-reservoir-fluid-properties_fig1.png|thumb|{{figure number|1}}Pressure-temperature phase diagram. Reservoir classification would be ''oil'' if reservoir temperature were less than 127 °F and ''gas'' if reservoir temperature were greater than 127°F.]]
    
Another common measure of oil specific gravity, defined by γ<sub>API</sub> = (141.5/γ<sub>O</sub>) –131.5, with units in °API.
 
Another common measure of oil specific gravity, defined by γ<sub>API</sub> = (141.5/γ<sub>O</sub>) –131.5, with units in °API.
  −
[[file:petroleum-reservoir-fluid-properties_fig1.png|left|thumb|{{figure number|1}}Pressure-temperature phase diagram. Reservoir classification would be ''oil'' if reservoir temperature were less than 127 °F and ''gas'' if reservoir temperature were greater than 127&deg;F.]]
      
===Gas specific gravity===
 
===Gas specific gravity===

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