A gas jar with lid is a common laboratory glassware that is used to contain and collect gas samples. It is a cylindrical container made of glass with a flat base and a cylindrical neck, which is sealed with a lid. The lid has one or more holes to allow tubes to be inserted and connected to gas sources or vacuum pumps. Gas jars with lids are commonly used for experiments that involve the collection of gases produced by chemical reactions, such as the production of hydrogen gas through the reaction of magnesium with hydrochloric acid. They can also be used to store and transport gases, as the lids help to prevent leaks and keep the gases contained. Gas jars with lids are available in a variety of sizes and can be made from different materials, including borosilicate glass and plastic. The choice of material and size depends on the specific requirements of the experiment or application.