All parts to build 1 salt-powered robot

or stethoscopes

Color reference card for study and display

An engaging blend of science and art

🛒 Size: 17 x 9 x 6 cm

radiometer eco toy All parts to build 1Watch Light Turn into Motion with the Solar Radiometer! Invented in 1873, this beautiful glass Radiometer transforms light into gentle movement. When exposed to sunlight or a lamp, the vanes spin inside their vacuum sealed globe, illustrating the conversion of light into kinetic energy. Each of the four vanes has a black side and a white side, causing them to rotate as photons strike them. A mesmerizing fusion of physics, history, and aesthetics, this