A dropper is a small tool designed to dispense liquid one drop at a time. You squeeze a rubber bulb at the top, which draws liquid up into a glass or plastic tube. When you squeeze the bulb again gently, the liquid comes out in controlled drops.

Droppers appear in science labs, where students use them to add precise amounts of chemicals to experiments. They're essential in medicine too: eye drops and ear drops come with droppers so you can deliver exactly the right amount without spilling or wasting. Artists use droppers to mix exact quantities of paint or dye. Even bakers sometimes use droppers to add food coloring to frosting, adding one tiny drop at a time until the color looks just right.

The dropper's power comes from its precision. Instead of pouring and hoping you get the right amount, you control each drop. When a recipe calls for “three drops of vanilla extract,” a dropper lets you add exactly three, not a splash or a puddle. Scientists especially value this control because a single extra drop can change an entire experiment's results.