Bell jar

A Bell jar is a sealed, transparent container made of glass or plastic, shaped like a dome or bell, used to create a controlled environment. It’s often employed in scientific experiments to isolate objects from external factors, such as air or moisture. By vacuuming or controlling the atmosphere inside the jar, researchers can study things like pressure effects, conduct experiments free from contamination, or observe biological processes in a controlled setting. In everyday use, Bell jars are also used for decorative displays or to preserve items under specific atmospheric conditions.