Convert 0.02 mL to microliters (μL).

• A. 0.02 μL
• B. 0.2 μL
• C. 2 μL
• D. 20 μL

Answer: (D)

Understanding how to convert between milliliters and microliters. A milliliter is equal to 1000 microliters, so to change mL to μL you multiply by 1000. For 0.02 mL, multiply 0.02 by 1000 to get 20 μL. In other words, moving the decimal three places to the right turns 0.02 into 20. This reflects that microliters are a thousandth of a milliliter. In context, this small-volume conversion is common in lab work when precise pipetting is needed. If the decimal is moved fewer or more places, you’d end up with 0.2 μL or 2 μL, which would correspond to different milliliter values and are not correct for this conversion. The correct result is 20 μL.