How many mL are there in 1 liter?

One liter is equivalent to 1,000 milliliters. This conversion is based on the metric system, where the prefix "milli-" denotes one thousandth of a unit. Since 1 liter is defined as exactly 1,000 milliliters, the correct answer reflects this standard measurement. Understanding this relationship is fundamental in nursing calculations, as precise conversions are crucial for administering medications and fluids accurately. Additionally, knowing that there are 1,000 mL in a liter is a key foundational concept when working with larger quantities in clinical settings.