In the international crude oil market, such as Brent crude oil futures, WTI and Shanghai International Energy Trading Center, barrels are used as the unit of measurement of crude oil. Generally speaking, the unit of crude oil in western countries such as the Organization of Petroleum Exporting Countries, Britain and the United States is usually expressed in barrels (bbl), while China and Russian countries often use tons (t) as the unit of crude oil.

The conversion relationship between tons and barrels of crude oil is: 1 ton (crude oil) =7.33 barrels (crude oil), that is, one barrel is a little more than 136 kg. Although there is a fixed conversion relationship between tons and barrels, the density of crude oil varies widely because tons are quality units and barrels are unit of volume. Therefore, in crude oil trading, if calculated according to different units,

Garbage introduction

Litter, usually referred to as liter for short, is a unit of capacity measurement, and the symbol is L. In the past, it was written in lowercase as a symbol, but due to the inconvenience of printing, L was printed in capital letters. L itself is not a unit of the International System of Units (SI), but it is a metric unit, which is accepted to be combined with SI.

The original French metric system was promoted to the basic unit, and litre was developed from the older unit litron, which came from Greek translated from Latin, and was about 0.83 1 liter. The liter is also used in the later metric systems, which is a non-SI unit accepted by the International System of Units.

Liters are usually used to describe the volume of containers and liquids, while cubic meters (and their derivative units) are usually used to describe the size of objects themselves. Liters are also commonly used in other units of measurement. For example, when the density unit is kg/L, the density of water can be approximately 1, which is convenient for comparison with other liquids.