At present, 34 light crude oil produced in Saudi Arabia is usually used as the standard in the world. This crude oil can be poured into 7.33 barrels per ton, which is about 42 gallons per barrel. Converted into liters, it is about 3.785 liters per gallon, so the capacity of a barrel is 42×3.785= 158.97 liters, which is 159 liters.

In addition to gasoline and diesel, there are some kerosene and asphalt extracted from a barrel of crude oil. If all regions are averaged, gasoline accounts for the heaviest proportion, reaching 60%, followed by 15% diesel oil and 15% kerosene, and then the asphalt content is the lowest, reaching 10%.

The content of asphalt and paraffin in Middle East crude oil is much less, and most of them are gasoline, diesel and kerosene. If the average gasoline content of a barrel of crude oil is calculated, the gasoline that can be extracted is 158.97×50%=79.5 liters, but these data can only be used as a reference, subject to the actual data.

Physical properties of crude oil

Generally, the relative density of crude oil is between 0.75 and 0.95, and a few are greater than 0.95 or less than 0.75. Crude oil with a relative density of 0.9- 1.0 is called heavy crude oil, and crude oil with a relative density less than 0.9 is called light crude oil.

The viscosity of crude oil refers to the internal friction generated when crude oil flows. The viscosity of crude oil depends on temperature, pressure, dissolved gas and its chemical composition. Its viscosity decreases with the increase of temperature, increases with the increase of pressure, decreases with the increase of dissolved gas, and decreases with the increase of light oil components.

The viscosity of crude oil varies greatly, generally between1-100 MPa s. Crude oil with high viscosity is commonly called heavy oil, which has poor fluidity and is difficult to develop heavy oil. Generally speaking, crude oil with high viscosity has higher density.

The temperature at which crude oil cools from liquid to solid is called freezing point. The freezing point of crude oil is about -50℃-35℃. The freezing point is related to the content of components in petroleum. High content of light components, low freezing point, high content of heavy components, especially high content of paraffin, so the freezing point is high.

Refer to the above content: Baidu Encyclopedia-Crude Oil