When units of measurement are expressed by letters, the letters of unit symbols are generally lowercase; When the unit comes from the name, the first letter of the symbol must be capitalized. Only the unit of volume "L" is special, and this symbol can be written as capital L or lowercase L. This is because the symbol of "L" is lowercase at first, because lowercase L is difficult to distinguish from Arabic numeral 1.
Later, the International Metrology Congress made a resolution that the symbol "L" can be written as an uppercase L, so that lowercase letters can be used together when lowercase letters have not been abolished. This is the only symbol in the international system of units that can be capitalized rather than named after scientists. According to the writing requirements of international units, the letter "m" is used to represent milli (10-3) and should not be mixed with the letter "m" representing mega (10 6).
Extended data:
Unit conversion
1L= 1000mL？
1000 ml = 1000 cubic centimeters = 1 cubic decimeter
1 liter = 1 decimeter cubic = 1000 ml = 1000 cubic centimeter = 1000000 cubic millimeter.
1 ml = 1 cm (cubic centimeter) = 0.00 1 decimeter (cubic decimeter)
1 m3 = 1000 liter = 1000 cubic decimeter = 1000000 ml = 10000000 cubic centimeter =10000000 cubic millimeter.