A Kipp's apparatus is a laboratory apparatus used for the production of small volumes of gases. It is typically made of glass and consists of three main parts: a cylindrical reservoir, a vertical tube, and a delivery tube. The reservoir is filled with a liquid that reacts with the material to produce the gas, and the vertical tube acts as a gas separator to prevent the liquid from entering the delivery tube. The delivery tube is used to collect and measure the gas that is produced. Kipp's apparatus is commonly used in chemistry experiments and is particularly useful for producing hydrogen and carbon dioxide gas.