This test method covers the determination of the density or relative density of light hydrocarbons including liquefied petroleum gases (LPG) having Reid vapor pressures exceeding 101.325 kPa (14.696 psi).
API MPMS Chapter 9.2
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API MPMS Chapter 9 – Density Determination, Section 2-Standard Test Method for Density or Relative Density of Light Hydrocarbons by Pressure Hydrometer, Fourth Edition