Page 25 - Demo

Your Safer Source for Science
ENERGY, continued
Heat Transfer Kit
Students fill one insulated container with hot water and the other with cold water. Then they link the two containers with an aluminum heat transfer bar. Students record the temperature change of the water in the cups over time and relate the change to the associated heat transfer. Purchase one for use as a class demonstration or one for each laboratory group.
AP4536 I $25.40
Collapsing Can—Demonstration Kit
Here’s a forceful demonstration—over 1,800 lbs of force! This demonstration will convince students that air exerts significant pressure. Simply place about a centimeter of water in the bottom of the can and heat it until it boils and steam comes out of the uncapped top. Remove the can from the heat, cap it tightly and watch and listen to the drama. As the can cools, a vacuum forms inside and the can dramatically collapses. A real attention-getter. Includes one can and detailed instructions.
AP4695 I $12.65
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 $16.35
Heat Convection in Fluids— Demonstration Kit
These two innovative demonstrations let you create visible convection currents in both water and air. Dramatically show the effect of convection currents in air with a lighted candle. Follow this up by observing convection currents created when a hot colored liquid rises and a cool clear liquid sinks. Includes comprehensive Teacher Notes for relating these phenomena to real-world convection patterns, such as weather and ocean currents.
AP7207 I $30.40
FLINN SCIENTIFIC I ENERGY 23
Radiometer
One of the all-time classic solar engines, the Radiometer demonstrates the effect of infra- red radiation with the spinning of its vanes. Just set it in bright light or the sun, and away it goes. The hows and whys of solar motion are discussed in the accompanying literature.
AP1948 I $15.50
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 remark- ably 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 $25.75