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How many milliliters do college students usually need for lunch boxes?
There is no specific provision for this. Boys eat more, which can be 1200ml, and girls can be 900ml.

ML is milliliter, the unit of measurement. When the unit of measurement is represented by letters, the letters of the unit symbols are usually lowercase. When the unit comes from a person's name, the first letter of the symbol must be capitalized.

Only unit of volume "L" is special, and this symbol can be written as uppercase L or lowercase L.

This is because the symbol of "L" is lowercase at first, and it is difficult to distinguish lowercase L from Arabic numeral 1. Later, the International Metrology Congress made a resolution that the symbol "L" can be written as a capitalized L, so that lowercase L can be used with capitalized L.