the noise of the alarm clock fading as the air is pumped out being used to demonstrate the effect. By additionally placing a microphone inside the bell jar and observing that the sound detected by the microphone reduces as the air is pumped out, the effect of absorbance of the sound by the glass of the jar itself can be excluded.

Candle in a bell jar experiments

Another common experiment using a bell jar involves placing a jar over a lit candle, and observing that the flame goes out, demonstrating that oxygen

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