The alarm is ringing inside the glass jar.
The pump slowly sucks the air out of the jar.
What happens?
What does this mean?
What can you say about what the sound needs to be able to your ear?
This experiment might also answer the question:
Is there sound in space?
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What did you learn during this investigation?
What surprised you?
What new thinking or ideas did you have?
What was your favourite experiment?
What did you find hard?