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Science and Technology night at Hiawatha Elementary School. |
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Christina Arisio and James Lovette draw a crowd with their demonstration. |
Putting dry ice in soapy water makes bubbles from evaporating CO2. |
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The bubbles soon foam over the top of the flask |
Balloons are blown up at room temperature then frozen in liquid nitrogen. The cold temperature causes the air inside the balloon to contract into a small volume. When the balloons are removed from the liquid nitrogen, they blow back up to original volume. Great demonstration of PV = nRT. |
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Freezing Flowers in liquid nitrogen makes them become brittle. |
The cold flowers can be crumbled or smashed into tiny pieces. |
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What a mess! |
The children had a blast. |
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