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지문 1
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Imagine you want to make chocolate candy for Valentine's Day. |
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You try to melt chocolate in a pan. |
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Suddenly, it starts burning! |
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Now the chocolate is overcooked. |
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Is there a better way to melt it? |
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You can use a double boiler. |
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A double boiler is easy to make and use. |
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You only need a pot, a bowl, and water. |
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First, pour the water into the pot and set the bowl over the water. |
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Next, put some chocolate in the bowl. |
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Then place the pot on the stove and set the heat to a low temperature. |
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The chocolate melts nicely as the water boils slowly. |
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How does the double boiler work? |
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As the water boils, the hotter water molecules move up and the cooler ones move down. |
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Then, the cooler molecules heat up and rise again. |
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As this happens over and over, the temperature rises. |
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This process is called "convection." |
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During convection, steam from the boiling water heats the whole bowl. |
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This makes the chocolate melt evenly. |
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Now, you can melt chocolate nicely. |
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Let's make delicious chocolate candy! |