Units of volume
The unit of volume in the International System of Units is the cubic meter, which is represented by the symbol m3.
In some fields or applications, it is convenient to use different units to simplify the discussions or writings. For instance,
- Everyday quantities of liquids are often measured in units of a litre, symbol l, which is the volume occupied by a cubic decimetre.
- Large quantities of liquids, such as oil, and sometimes other materials, may be measured and traded in units of barrels. There are many different reference volumes called barrels, depending on the nature of the content.
Traditional units are still in encountered in some countries: Imperial units such as the gallon or the fluid ounce were in widespread use within the British Empire. Some of them are still popular in the United States, which also uses units like the bushel, or the quart, the cup and the teaspoon (in cooking recipes, for example). See U.S. customary units for more examples.