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Does Adding Salt Lower the Boiling Point of Water?

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Salt does not lower the boiling point of water.

Salt does not lower the boiling point of water. In fact, it causes the water to boil at a slightly higher temperature.

Markus Schweiss

Question: Does Adding Salt Lower the Boiling Point of Water?

Does adding salt lower the boiling point of water? You may have heard this and wondered if it was true. Here is a look at the science behind salt and boiling water.

Answer: No, adding salt does not lower the boiling point of water. Actually, the opposite is true. Addin salt to water results in a phenomenon called boiling point elevation. The boiling point of water is increased slightly, but not enough that you would notice the temperature difference. You would have to add 58 grams of salt just to raise the boiling point of a liter of water by one half of a degre Celsius.

If you add salt to water, be sure to add it before boiling the water. Adding salt to water that is already boiling may cause the water to splash up and boil more vigorously for a few seconds.

 

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