Five hundred ml, or milliliters, is the same volume as a cube 7.937 centimeters on a side. This is approximately the same volume as two small square milk containers.
The liter is the basic unit of volume in the metric system; it can be subdivided into 1,000 milliliters. Each milliliter is 1 cubic centimeter; the figure of 7.937 above is calculated by taking the cube root of 500. For those used to the American measurement system, a liter is just about 6 percent larger than a quart, while for those in the United Kingdom, an Imperial quart is approximately 14 percent larger than a liter.