How many mL are in a half-liter bottle?

A half-liter bottle contains 500 mL because there are 1000 mL in a full liter. Thus, when you divide 1000 mL by 2 to find half of a liter, the calculation yields 500 mL. This understanding of the metric system and conversion between liters and milliliters is crucial, especially in clinical settings where precise dosages are often provided in milliliters. Knowing that 1 liter equals 1000 mL helps reinforce the relationship between these units, making it easier to perform similar conversions in the future.