Forgive me, but it’s been quite a while, my high school chemistry is a tad weak. There are two main reasons that the water boils over. First, adding pasta to the pot raises the water level in the pot due to the weight of the dry pasta displacing water before it cooks. Second, as the pasta cooks, some of the starch in the pasta is stripped out by the boiling water. This makes the water a little thicker as a result. Both these reasons can contribute to the pot boiling over.
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