Re: Salty boling water
- From: "Herman Family" <the_sawdust_place_no_underscore@xxxxxxxxxxxxxxx>
- Date: Fri, 22 Dec 2006 05:33:33 GMT
"pepe" <pepe5234@xxxxxxxxxxx> wrote in message
news:5zsih.455$8f.229@xxxxxxxxxxxxxxx
When heating salty water, if the salt is together in the center of theThe salt gives a nucleation point at which the steam bubbles can form.
recipient, the water around the salt starts to boil before the rest of the
water. If the water is stirred, so the salt is distributed all around the
recipient, it finishes the boiling until the whole water gets to the
boiling point. According to the cryoscopy (Raoult's Law) the salt should
delay the boiling point, but apparently in this case the salt makes the
water to boil earlier. ¿Can someone explain this observation?
Thanks
Actually, under each salt crystal, it is a little hotter than if the salt
crystal wasn't there. At any rate, to boil, water needs a place for the
bubbles to form (pits, bumps, etc), and sufficient heat. Those nucleation
points get a little hotter than the rest of the water, produce steam, and
send a bubble up.
If you have a perfectly smooth pot, with no agitation, then you can
carefully superheat the water until the entire bottom is a little warmer
than the boiling point.
Note that the salt also increases the local boiling point, but the density
difference may make it easy for it to hold more heat in the salt water layer
without spreading it throughout the pot.
Michael
.
- References:
- Salty boling water
- From: pepe
- Salty boling water
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