The term GLASS TUBE can refer to two different pieces of laboratory equipment: a PIPETTE and a burette. A PIPETTE is a thin, glass tube with a bulb at one end that is used to transfer small amounts of liquid from one container to another. A burette is a long, graduated glass tube with a stopcock at one end that is used to measure and dispense precise amounts of liquid. Both the PIPETTE and the burette are commonly used in scientific laboratories.