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How does coffee climb
inside this little pot?

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This is a moka pot.

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Its bottom chamber holds water,

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with air above it.

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The funnel's stem
dips into that water,

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while its basket holds
the ground coffee.

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As the sealed pot heats,

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the trapped air warms

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and more water evaporates.

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Together, the air and water vapor

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raise the pressure above the water.

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That pressure pushes liquid water

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up the stem
and through the grounds,

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picking up flavor.

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The brewed coffee then rises

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through the chimney
into the top chamber.

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Brewing can begin
before the water boils.

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Keep the water below
the safety valve,

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and fill the coffee basket
without tamping.

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That's the little pot's secret:

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pressure moves the water.

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Follow for our next lesson:
the AeroPress.