How does adding cooking oil to water prevent it from boiling over when pasta is added?
Water molecules are polar and are strongly attracted to one another. When pure water is brought to a boil it bubbles but does not boil over. However, when pasta is added it begins to break down, disrupting the interaction between water molecules. As a result, the surface of each of the bubbles in the boiling water expands, causing the water to flow out of the pot. However, oil is nonpolar and does not mix well with water. When oil is added to the water beforehand it forms droplets at the surface that act as “bubble breakers.”
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