When converting milliliters to liters, what is the appropriate factor to use?

When converting milliliters to liters, the appropriate factor is that 1 liter is equal to 1000 milliliters. This means that to convert milliliters to liters, one would divide the number of milliliters by 1000. For example, if you have 5000 mL and you want to convert it to liters, you would perform the calculation 5000 mL ÷ 1000 = 5 L. This conversion factor is essential in pharmaceutical calculations, as precise dosing often requires accurate measurements in liters or milliliters, depending on the context.

The other options suggest incorrect relationships between liters and milliliters, which could lead to significant errors in calculations. Understanding this conversion is fundamental in pharmacy practice, where accurate measurement of liquid medications is critical for patient safety and effective treatment.