Minor repairs needed

The experiment basically works, but could do with some TLC...

Vacuums

Public summary: 

The idea of a vaccum is very different to what we experience in everyday life, with some surprising consequences! Oh, and the experiment involves balloons too!

Various demonstrations using a vacuum pump.
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5
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Electromagnetism

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Generate electricity and learn all about how it works!

Making electricity, and using it to spin a motor.
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Frequency of use: 
4
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Electrolysis

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Electrolysis in the process of splitting water into hydrogen and oxygen using electricity, and then recombining them explosively! We'll use talking about energy as an excuse to launch a ping pong ball into the air...

Splitting water into hydrogen and oxygen, and using the recombination of these to launch ping-pong balls.
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Frequency of use: 
5
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