API MPMS 9.3 pdf download Manual of Petroleum Measurement Standards Chapter 9.3 Standard Test Method for Density, Relative Density, and API Gravity of Crude Petroleum and Liquid Petroleum Products by Thermohydrometer Method Summary of Test Method 4.1 The density or API gravity, after temperature equilib- rium has been reached, is read by observing the freely floating thermohydrometer and noting the...