How many milliliters are in 1 fluid ounce?

How many milliliters are in 1 fluid ounce?

• A. 25 mL
• B. 30 mL
• C. 35 mL
• D. 40 mL

Answer: (B)

1 fluid ounce is about 29.57 milliliters, so for practical use it’s rounded to 30 mL. That makes 30 mL the best answer, since it’s the closest approximation to the exact value. The other options (25, 35, 40 mL) are noticeably farther from the true conversion and would lead to larger errors in measurements. In precise contexts, you’d use 29.57 mL, but for everyday CNA tasks, 30 mL is the standard quick conversion.

1 fluid ounce is about 29.57 milliliters, so for practical use it’s rounded to 30 mL. That makes 30 mL the best answer, since it’s the closest approximation to the exact value. The other options (25, 35, 40 mL) are noticeably farther from the true conversion and would lead to larger errors in measurements. In precise contexts, you’d use 29.57 mL, but for everyday CNA tasks, 30 mL is the standard quick conversion.