Page 25 - Demo

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ENERGY: TRANSFER & FORCES, continued
Ball and Ring Apparatus
Perform the classic “thermal expansion of metal” demonstration with this ball and ring apparatus. Brass ball passes freely through ring at room temperature, but when the ball is heated in a flame, it no longer passes through the ring. Nonconductive handle provides excellent thermal insulation and keeps hands cool.
AP9031 I $16.75
Thermoelectric Generator Demonstrator
Place each aluminum leg into a plastic cup with water. If the water temperature is the same, nothing happens. But, what happens if the water is hot on one side and cold
on the other? The fan starts to spin! If you connect the apparatus to a battery or DC power source, the effect is reversed—one cup of water is heated while the other is cooled. Amazingly simple demonstration to learn about relatively complex thermo- electric concepts, such as the Seeback effect, Peltier effect and Thomson effect. Thermoelectric generators may have an important impact as energy recyclers to harvest wasted heat energy from power plants. 2" L x 11⁄2" W x 9" H.
AP7905 I $35.60
Conductometer
Investigate how different types of metals conduct heat as you hold the center of the conductometer over a flame. Small amounts of wax placed in wells at the end of each metal rod melt at different rates demon- strating the relative thermal conductivity of each metal. The five metal rods are steel, nickel (or iron), aluminum, copper and brass. Plastic handle and instructions are provided.
AP9212 I $21.05
Galileo’s Gravity Drop
Dispel the most common myth about fall- ing objects and gravity. Re-create Galileo’s legendary Leaning Tower of Pisa experiment with the unique gravity-drop apparatus.
The mechanism in the apparatus allows you to simultaneously and accurately drop two balls with different masses. Listen for the sound of them hitting the floor at the same time—a great introduction to Newton’s first and second laws of motion!
AP7297 I $55.25
Ice Melting Blocks
Touch the identical-looking blocks. One feels cold to the touch, the other feels warm. Which block melts the ice faster—cold or warm? The result is unexpected! The cold block melts the ice cube remarkably faster than the warm block. How is this possible? The cold block
is a heat conductor. The warm block is an insulator. An unmistakable discrepant event that
is sure to clarify the difference between a heat conductor and a heat insulator. Instructions provided. 10 x 10 cm.
AP6488 I $26.55
ENERGY: TRANSFER & FORCES I FLINN SCIENTIFIC 23