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In a demonstration of Boyle's law,[br]

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we'll place the balloon[br]in a vacuum bell jar.

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We'll apply a vacuum, which basically [br]pumps out the air in the bell jar.

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The pressure outside the balloon[br]will be greater than the pressure inside.

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The balloon expands to try[br]and equalize the pressure.

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Volume and pressure are[br]inversely related to each other.

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When we release the vacuum,[br]the pressure increases

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and the volume decreases.

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As another demonstration of Boyle's law,[br]we will put a marshmallow peep

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into our vacuum jar.

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The marshmallow contains air[br]trapped in a mixture of gelatin and sugar.

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As we apply the vacuum,

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the pressure outside[br]is lower than the pressure inside

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the air in the peep will expand [br]to try and equalize the pressure.

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When we release the vacuum,

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the pressure increases, [br]and the volume decreases.

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As another illustration of Boyle's law,

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we will put some shaving cream[br]into our vacuum jar.

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The shaving cream contains air[br]trapped in a soap mixture.

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As we apply a vacuum, the pressure outside[br]is lower than the pressure inside,

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the shaving cream will expand to try [br]and equalize the pressure.

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As you decrease the pressure, [br]the volume increases.