Is a liter larger or smaller than a millimeter?

A liter is larger than a millimeter. A liter is a unit of volume equivalent to 1,000 cubic centimeters, while a millimeter is a unit of length. To put it in perspective, a millimeter is 1/1,000th of a meter, whereas a liter measures how much space an object occupies. Thus, they measure different dimensions and cannot be directly compared in size.