The Gas Jar (Specimen Jar),  is a cylindrical laboratory glass container made from clear soda glass commonly used for the collection, storage, and observation of gases or biological specimens. Its transparent construction allows clear visibility of the contents, making it suitable for demonstration and experimental purposes .The jar features a wide mouth and smooth rim, enabling it to be easily covered with a glass plate or lid when used for gas collection experiments. It can also be used as a specimen jar for preserving and displaying biological samples in laboratories and educational institutions.