Energy conversion: Optical to thermal Volume 20 | Gr. 3-12 | U27714 Download Materials list • Solar Balloon Energy Kit(s) (SB52005) • Digital laboratory thermometer (SB33552) • Measuring cup (WA29913) • Graph paper, 81/2″ x 11″ (9706099) • Stirling engine (SB49166) • PocketLab Weather Sensor (NA10341) • Hot pad for handling pan (SB01889) • Water Related