1. What is API Gravity?

API Gravity is a measure of how heavy or light a petroleum liquid is compared to water. It was developed by the American Petroleum Institute (API) as a way to standardize measurements of petroleum density.

2. How Does the Calculator Work?

The calculator uses the API Gravity formula:

Where:

• \( SG \) — Specific Gravity at 60°F

Explanation: The formula converts specific gravity (density relative to water) to the API gravity scale, where higher values indicate lighter (less dense) oils.

3. Importance of API Gravity

Details: API gravity is a crucial measurement in the petroleum industry used to classify oils as light, medium, or heavy. It affects pricing, transportation, and refining processes of crude oil.

4. Using the Calculator

Tips: Enter the specific gravity value measured at 60°F. The specific gravity must be greater than 0. The result will be displayed in degrees API.

5. Frequently Asked Questions (FAQ)

Q1: What is the range of API gravity values?
A: API gravity typically ranges from about 10° (heavy oils) to 50° (very light oils and condensates). Water has an API gravity of 10°.

Q2: How does API gravity relate to oil quality?
A: Higher API gravity generally indicates lighter, sweeter crude that yields more valuable products like gasoline with less processing.

Q3: Why is temperature specified as 60°F?
A: 60°F is the standard reference temperature for petroleum measurements to ensure consistency across different measurements and locations.

Q4: What's the difference between specific gravity and API gravity?
A: Specific gravity is a direct density ratio, while API gravity is an inverse scale specifically designed for petroleum products.

Q5: How is API gravity used in oil trading?
A: API gravity is a key specification in oil contracts and affects pricing - lighter oils (higher API) typically command premium prices.