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A cool guide of commonly believed myths
(i.redd.it)
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this post was submitted on 20 Jun 2024
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I question the salt in boiling water one. Sure it probably doesn't change the temperature or energy required but shouldn't it aid in nucleation to make the boil more bubbly?
Or are the existing impurities in most tap water such that salt doesn't add anything meaningful?
Salted water boils at a higher temp vs. unsalted water - this is known as boiling point elevation. But I don't know offhand (there's a formula) how much salt would be required to meaningfully raise the boiling point.
You would need enough salt to make a brine to noticably affect the boiling temperature. It takes about 30 grams of table salt per liter of water to raise the boiling temperature of water to 100.5 Celsius at sea level.. The only difference you would actually notice is your food is now inedible because you have used an entire restaurant table shaker of salt in your food.
If you throw it in just before it's boiling yes, you will see the water bubble up for a moment for the reason you said... once dissolved if anything at those amounts, it raises the boiling temp a little
A solution should theoretically boil at a higher point of vaporization and melt at a lower point of fusion ( becoming liquid from solid) .