A tool for determining the relative density of petroleum liquids, expressed as a degree API, provides a quick and standardized way to assess crude oil or refined product characteristics. For instance, a higher degree API generally indicates a lighter, more valuable crude. This measurement is calculated using a specific formula relating specific gravity to the API gravity scale.
This standardized measurement is essential for pricing, refining decisions, and pipeline transportation management. Historically, this method became a standard in the petroleum industry due to its simplicity and practicality, predating modern, more complex analytical techniques. It remains relevant today as a key indicator of hydrocarbon quality and remains integral to commercial transactions.