Which of the following is true regarding milligrams and milliliters?

Milligrams (mg) and milliliters (ml) are used to measure different types of quantities, which is why the statement indicating they are not equal is accurate. Milligrams are a unit of mass or weight, commonly used to quantify the amount of a substance, typically a solid. In contrast, milliliters are a unit of volume, used to measure liquids. Because these two units do not measure the same aspect of a substance, they cannot be equated to each other.

The distinction between mass and volume is crucial in medication dosing since different substances have different densities. For example, one milliliter of water weighs approximately one gram (or 1000 milligrams), but this relationship may not hold true for other substances. Understanding the difference between these units is essential for accurate medication administration and avoiding dosing errors.