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In a demonstration of Boyle's law,


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

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

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The pressure outside the balloon
will be greater than the pressure inside.

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The balloon expands to try
and equalize the pressure.

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Volume and pressure are
inversely related to each other.

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When we release the vacuum,
the pressure increases

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and the volume decreases.

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

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into our vacuum jar.

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

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As we apply the vacuum,

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the pressure outside
is lower than the pressure inside

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

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When we release the vacuum,

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the pressure increases, 
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
into our vacuum jar.

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The shaving cream contains air
trapped in a soap mixture.

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

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the shaving cream will expand to try 
and equalize the pressure.

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As you decrease the pressure, 
the volume increases.