Compound Bar Set, 1 Each

The Compound Bar Set by United Scientific is a thermal expansion demonstration set with four bimetallic bars: brass/aluminum, brass/iron, copper/iron, and brass/copper. Each metal expands at a different rate, so every pairing bends into a distinct curve when heated. Bars are stamped Al, Fe, and Cu for identification, and an activity guide is included. Physics and physical science teachers use it to compare expansion coefficients.