L represents the volume unit.

The liter is expressed as L in the International System of Units, and its secondary unit is milliliters (mL). The conversion relationship between liters and other volume units is: 1L=1000mL=0.001 cubic meters=1 cubic decimeter=1000 cubic centimeters.

In the ancient Chinese system of Han and Tang Dynasties, one dendrobium = 10 dou = 100 liters = 1000 together = 2000 龠. In the Song Dynasty, the weight unit stone was used as the capacity unit, one stone = 2 dendrobium = 10 buckets, which is now abolished.

Extended information:

The symbol for liter was originally l. Because it was easily confused with the Arabic numeral 1, the 16th International Conference on Weights and Measures in 1979 approved the use of L as the symbol for liter. The symbol for rising in international standards is "l, L"; the scientific and technological community tends to use L, and my country and some countries (such as the United States) recommend the use of L (expressed as "L, (l)" in the standard). It should not be changed to lowercase after adding a prefix, for example, mL should not be changed to ml.

In addition, in an era when science and technology were not developed enough and standards of weights and measures were not popular enough, people generally used capacity units such as "liters and buckets" to measure the weight of food. This is a mark of the times. There are many literary works that reveal that landlords defraud farmers by using loan sharking methods of small promotions (fighting) and big promotions (fighting) advancement, which reflects the exploitative system of feudal society.

Baidu Encyclopedia - Liter (volume unit)