Pyrometer Linear Expansion Demonstration with Aluminum, Brass, and Iron Bars

The Eisco Labs Pyrometer is a linear expansion demonstration apparatus mounted on a metal base with a large scale for easy viewing. The kit includes three expansion bars — aluminum, brass, and iron — each 10" long and 0.25" in diameter. The complete apparatus measures 12" long and 5" wide. Students heat each metal bar and observe the resulting expansion on the dial indicator, comparing how different materials expand at different rates. This apparatus demonstrates linear thermal expansion, a key concept in thermodynamics and material science. Suitable for physics classrooms.