Here's why:

* A drop is a very small amount of liquid. The size of a drop can vary depending on the dropper and the liquid itself.

* A fluid ounce is a much larger unit of volume. There are about 29.5735 milliliters in a fluid ounce.

* It would take many, many drops to equal one fluid ounce. The exact number would vary depending on the size of the drops.

Think of it this way: you could fit hundreds or even thousands of drops of water into a single fluid ounce!