This linear expansion apparatus is designed for demonstrating and measuring the thermal expansion of different metals. It includes a heavy metal base measuring 27 inches long, a metal tube with fittings for steam inlet, steam outlet, and thermometer placement, and three metal rods (aluminum, brass, and iron) each measuring 19.75 inches long. An economy dial gauge reads the amount of expansion, while a thumb screw at the opposite end creates a fixed reference point for the rod during testing. The thermometer is not included. This apparatus is well suited for physics classrooms studying thermal properties and the concept of linear expansion in solids.