Measurement of API Gravity From Its Density
To derive the API gravity from the density, the density is first measured using either the hydrometer, detailed in ASTM D1298 or with the oscillating U-tube method detailed in ASTM D4052. Density adjustments at different temperatures, corrections for soda-lime glass expansion and contraction and meniscus corrections for opaque oils are detailed in the Petroleum Measurement Tables, details of usage specified in ASTM D1250. The specific gravity is then calculated from the formula below and the API gravity calculated from the first formula above.
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