 ##  [Specific Gravity](/specific-gravity) 

  ##  [Specific Gravity](https://engineering.quantumdictionary.io/specific-gravity-0) 

  
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**Engineering &amp; Applied Technologies Dictionary**

 
Definition

The dimensionless ratio of a substance's mass density to the mass density of a specified reference substance under stated conditions (commonly water for liquids and solids); it indicates relative heaviness without units and requires the reference substance and its temperature/pressure to be specified.