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The boiling point of heavy water is higher than "regular" water because the water is a bit more massive (owing to the extra neutrons stuck to protons in hydrogen nuclei) and more energy is needed to allow the heavy water to change state. Boiling means the molecules gain kinetic energy and "escape" the bonds that are holding the water molecules together in their liquid state. Those same bonds act on the heavy water molecules just like "light" water, but because those molecules are a bit more massive, heavy water molecules need more kinetic energy to "break loose" and "escape" the liquid. That means higher temperatures are required for higher concentrations of heavy water to bring it to a boil. A link is provided to the Wikipedia article on heavy water.

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15y ago
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6y ago

The molecules have different isotopic composition.

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13y ago

The heavy hydrogen, deuterium.

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Q: Why is the boiling point of heavy water higher than that of ordinary water?
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