# How do you calculate API gravity?

## How do you calculate API gravity?

The formula for API gravity is API = (141.5/SG) -131.5 where SG is the specific gravity of the petroleum liquid being measured. For example, for an API gravity of 50, add 131.5 to obtain 181.5.

How do you convert specific gravity to API?

How to estimate API gravity?

1. Divide 141.5 by the specific gravity of the liquid.
2. Subtract 131.5 from the resultant to obtain the API gravity.

Is API the same as specific gravity?

API gravity is thus an inverse measure of a petroleum liquid’s density relative to that of water (also known as specific gravity). It is used to compare densities of petroleum liquids. For example, if one petroleum liquid is less dense than another, it has a greater API gravity.

### How do you calculate the API gravity of crude oil?

API stands for the American Petroleum Institute, which is the industry organization that created this measure.

1. Calculation of API gravity.
2. API = (141.5/Specific Gravity) – 131.5.
3. API gravity of crude oil grades.

How do you convert gravity to specific gravity?

Multiply the density by the acceleration of gravity (9.81) to calculate the specific weight. In our example, the specific weight is 840 x 9.81 = 8,240.4. Measure or obtain elsewhere the volume of the substance. Convert the volume to the cubic meter unit.

How do you convert specific gravity?

Specific gravity is a ratio of the density of a substance to the density of a reference substance, usually water. Since the density of water is one gram per cubic centimeter, you calculate specific gravity by dividing the density of a substance by one gram per cubic centimeter.

## How do you convert specific gravity to pounds per gallon?

In equation form: SG = ∂/∂w. Because this number is dimensionless, it’s valid for whatever system of units you choose. If you need density in pounds per gallon, just multiply specific gravity by the density of water in those units.

How do you calculate specific gravity of petrol?

For fuels, specific gravity can be determined by dividing the density of the fuel (in units of pounds per gallon) by the density of water (8.325 pounds per gallon). Let’s look at one example. Sunoco Supreme weighs 5.95 pounds per gallon. Applying some math: 5.95 / 8.325 = 0.715.

What is API scale?

API gravity scale in British English noun. the American Petroleum Institute gravity scale: a universally accepted scale of the relative density of fluids that is used in fuel technology and is measured in degrees API. One degree API is equal to (141.5/d)–131.5, where d = relative density at 288.7 K.

### What is API gravity in crude oil?

API gravity is short for American Petroleum Institute gravity, an inverse measure that is used to determine the weight of petroleum liquids in comparison to water. If a liquid has API gravity of more than 10 it is considered a light oil that floats on water.

How do you calculate specific gravity from API gravity?

API Gravity = (141.5/SG) -131.5 SG= 141.5/ (API Gravity + 131.5) Specific Gravity (SG) = density of oil/density of water (SG of water is 1 and API of water is 10) So if the oil for example has an API gravity of 40 then its specific gravity will be 141.5/ (40+131.5) =0.825

How do you convert kg/m3 to API degrees?

Conversion to API Gravity (60°F) by GOST 3900-85 To convert from kg/m3 to API degrees at 60°F, enter the density in kg/m3 and the temperature at which the measurement was made in the appropriate fields. Click on the “Calculate” button to get the result.

## What is API gravity of oil?

American Petroleum Institute (API) gravity is used to demonstrate how the density of crude oil compares to the density of water. The API gravity of oil can be calculated by using the equation below:

What happens if the API gravity is less than 10?

If the API gravity of a liquid is greater than 10° API, the liquid will float on water. However, if the value of API gravity is less than 10, it implies that the liquid is heavier than water and will sink. How to calculate API gravity from specific gravity?