This Charles' Law Apparatus is constructed from borosilicate glass and consists of a U-shaped 15mm diameter glass tube with one 220mm plain limb, one 120mm graduated limb (graduated 25 to 35 x 0.2mL) terminating in a 37mm diameter bulb, and a third limb (185 x 6mm) jointed at right angles to the plane of the other two. A short length of rubber tubing with two pinch clips is mounted via rubber bung at the end of the wide-bore plain limb. Includes a 1000mL tall-form beaker and stirrer. The apparatus demonstrates Charles' Law (the relationship between volume and temperature of a gas at constant pressure). Suitable for physics and chemistry classrooms studying gas laws.