Vial is a term most often used in the medical field. A vial can be a multi-dose container for serums, compounds, and other liquids. Vials are often made from glass, and they have two distinct features from ampules: they may be sealed or not, and they are sealed with either a vial plug or screw cap.

To use a vial, you will need a syringe and needle. Pull the plunger back on the syringe to file it with the compound. With the needle pointed up, poke the needle into the vial. Push the plunger back down to put air into the vial and then pull the plunger back to draw the liquid into the syringe.