Boys Toys
Girls Toys
Neutral

Bubbles
Flying Toys
Riding Toys
Water Toys

Arts & Crafts
Construction Sets
Musical Toys
Puzzles & Games
Water Play

Animals
Chemistry
Environmental
Geology
Insects
Natural History & Dinosaurs
Optics
Plants
Science Project Kits
Space & Astronomy
Weather

Activity Toys
Baby Books
Bead, Wire & Mazes
Plush & Bonding
Sensory Balls

All Ages
3 months & Up

6 months & Up
9 months & Up
12 months & Up
18 months & Up
2 & Up
3 & Up
4 & Up
5 & Up
6 & Up
7 & Up
8 & Up
10 & Up
12 & Up

Radiometer

<< Previous in Alternative Energy & Environmental Next in Alternative Energy & Environmental >>

MSRP: $9.36
Price: $7.80
Item Number: 4106
The vanes, or wings, in the Radiometer are alternately dark and light in color. When the light strikes these wings, it transfers heat to each one - but not the same degree. The lighter wing reflects the rays, and the darker wing absorbs the rays. The stronger the light the more energy there is to heat up the darker side of the wing causing the wings to spin faster as the light gets brighter. Its the sphere powered by the sun. Ages 8 and up.