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Bob Symes explains burst water pipes and icebergs at the same time; they share the same scientific principle. Water expands when it freezes, a fact proven by Bob’s freezer and some sample containers of water that have been left inside. When a piece of ice is put into a tank of water, it floats, but only about 1/10th of it sits above the water—the tip of the iceberg! (5 minutes)



 
    

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Part of the Series : The Way Things Work
     


Only available in the US and Canada.




What Magnets Do

A compass needle points North because the Earth has a magnetic force that attracts the metal in the needle. Bob Symes shows what happens to the compass needle if a wire with an electric current is placed next to the compass. He proves that this princ...(more details)
 
How Levers Work

A thin ruler can lift a heavy paint can. How? Watch Bob Symes demonstrate the power of the lever, how it works, and how moving the position of the fulcrum changes its ability to work. (5 minutes)(more details)
 
How Batteries Work

Although batteries may look complicated, they are as simple as lemons. Bob Symes uses this fruit as the source of electrolytes-a basic component of all batteries. He attaches two dissimilar metal rods (one zinc, one copper) to a lemon and then measur...(more details)
 
How Gears Work

Bob Symes demystifies the subject of gears. He explains how thinking about gears as "round wedges" reveals why a large gear wheel spins slowly but produces a lot of power, while a small gear wheel spins quickly but produces little power. (8 minutes)(more details)
 
How Light Changes Color

What produces color, and why does a color look different when viewed through lenses of different colors? Bob Symes investigates the mysteries of color with several simple experiments. By spinning a disk that has been painted with equal segments of bl...(more details)
 


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