When converting 1 liter to milliliters, how many milliliters are in 1 liter?

The conversion between liters and milliliters is based on the metric system, where 1 liter is defined as equal to 1000 milliliters. This relationship is derived from the fact that the metric system is structured in powers of ten, making it straightforward to convert between units.

Considering the context of the question, when you need to convert liters to milliliters, you multiply the number of liters by 1000. Therefore, since 1 liter equals 1000 milliliters, the correct answer reflects this conversion directly. Understanding this fundamental metric conversion is essential for various nursing and medical calculations, ensuring accurate dosage and fluid management for patients.