An ampoule is a small sealed vial that is used to contain and preserve a sample, usually a solid or liquid. They are commonly made of glass and are designed to protect their contents from air and contaminants. Ampoules are often used in laboratories and the pharmaceutical industry to store sensitive substances, such as vaccines or chemicals. To open an ampoule, the neck is typically snapped off, allowing access to the contents inside. This method of sealing ensures that the material remains sterile and stable until it is needed. Ampoules are also used in the cosmetic industry for single-use products, providing convenience and maintaining product integrity.