1 liter equals which of the following?

• A. 1000 ml
• B. 1 l
• C. 0.1 liter
• D. 1 kl

Answer: (B)

Understanding how liters and milliliters relate in the metric system helps you compare volumes quickly. A liter is a basic unit of volume, and 1 liter equals 1000 milliliters. When asked what 1 liter equals, the most direct match is to express it with the same unit—1 liter. This shows the quantity without changing the unit. The other options either switch units or refer to different amounts: 1000 milliliters is the same as 1 liter but in a different unit; 0.1 liter is only 100 milliliters, not 1 liter; and 1 kiloliter equals 1000 liters, which is much larger.