Which conversion is accurate for volume measurements?

The conversion of 1 cup to 240 ml is accurate and widely used in both cooking and pharmacology. In the context of volume measurements, one cup represents a standard measurement equivalent to 240 milliliters. This conversion is important as it provides a clear understanding for pharmacists and technicians when preparing medications that involve liquid volumes, ensuring accurate dosages and formulations.

Other volume conversions do not align with standard measurements. For example, 1 cup is traditionally known to convert to 240 ml, not 500 ml, which is the reason why the first option is not correct. The fluid ounce to milliliter conversion of 1 fl oz to 20 ml is also not accurate, as 1 fluid ounce is equal to approximately 29.57 ml. The conversion of weight in ounces to grams is incorrect as well; 1 ounce is approximately 28.35 grams, not 28 grams, making that option inaccurate too. Thus, the conversion of 1 cup equating to 240 ml stands as the correct and accepted standard.