How many milliliters are in 1 liter?

In the metric system, volume measurements are based on powers of ten, making conversions straightforward. One liter is defined as being equal to 1000 milliliters. This relationship stems from the metric definition where 1 liter is the volume of a cube that measures 10 centimeters on each side, and since 1 milliliter is equivalent to a cubic centimeter, it follows that 1 liter contains 1000 milliliters. Therefore, if you need to convert liters to milliliters, you multiply the number of liters by 1000. In this case, 1 liter multiplied by 1000 milliliters per liter gives you 1000 milliliters. This clear metric relationship is why 1000 milliliters is the correct answer.