One liter is equal to how many milliliters?

• A. 100 ml
• B. 1,000 ml
• C. 10,000 ml
• D. 1,000,000 ml

Answer: (B)

Understanding metric volume units: the prefix milli- means one thousandth, so milliliters are the smaller units that fit into a liter. To convert from liters to milliliters, multiply by 1,000. Therefore, 1 liter equals 1 × 1,000 milliliters, which is 1,000 milliliters. For quick reference, 100 mL is 0.1 L, 10,000 mL is 10 L, and 1,000,000 mL is 1000 L. So the correct value is 1,000 milliliters.