An ampul is a small sealed vial that is used to contain and preserve a sample, usually a liquid. It is commonly made of glass or plastic and is designed to be broken open to access its contents. Ampuls are often used in laboratories, pharmacies, and medical settings to store medications, vaccines, or chemical samples. The design of an ampul ensures that its contents remain sterile and protected from contamination. Once opened, the ampul must be used quickly to prevent degradation of the material inside. Ampuls are an important part of the packaging for many pharmaceutical products, including those related to vaccination and medical treatments.