What is a medicine dropper primarily used for?

A medicine dropper is primarily used for transferring small amounts of liquid due to its design, which allows for precise control when dispensing fluids. This tool is especially useful in settings where accuracy is crucial, such as in medical or laboratory environments. It typically has a tapered tip, enabling the user to release drops of liquid one at a time or in controlled quantities, which is essential for tasks that require careful measurement, such as administering medicine or conducting experiments that involve reagents in specific volumes.

In contrast, options highlighting heating flammable substances, measuring large volumes of liquid, or maintaining constant temperatures are unrelated to the primary function of a medicine dropper, as they involve different tools or methods that serve distinct purposes. For instance, heating requires specialized equipment like a Bunsen burner or hot plate, measuring large volumes typically demands graduated cylinders or beakers, and maintaining constant temperatures often utilizes incubators or water baths.