How do bubbles (and crystals) form?

  • 13 Replies
  • 4299 Views

0 Members and 1 Guest are viewing this topic.

*

Offline JimBob

  • Global Moderator
  • Neilep Level Member
  • *****
  • 6564
  • Moderator
    • View Profile
How do bubbles (and crystals) form?
« on: 15/03/2009 23:12:46 »
I just boiled some water for cooking noodles. As the water came to a boil bubbles started to form. Where and how do they form?

I believe that I have read the form on "nucleation locations" where the phase change occurs but how and why?

I also know that crystals - the liquid to solid phase change - also take place at nucleation locations. Again, how and why? It is probably very closely related.
« Last Edit: 15/03/2009 23:15:07 by JimBob »
The mind is like a parachute. It works best when open.  -- A. Einstein

*

Ethos

  • Guest
How do the bubbles form?
« Reply #1 on: 15/03/2009 23:15:28 »
I just boiled some water for cooking noodles. As the water came to a boil bubbles started to form. Where and how do they form?





Look up surface tension in Wikipedia.

*

paul.fr

  • Guest
How do bubbles (and crystals) form?
« Reply #2 on: 15/03/2009 23:50:45 »
Isn't the liquid water turning gasseus due to superheating around the element? Sure that 'Sophie' will have a better the correct answer.

*

Offline JimBob

  • Global Moderator
  • Neilep Level Member
  • *****
  • 6564
  • Moderator
    • View Profile
How do bubbles (and crystals) form?
« Reply #3 on: 16/03/2009 02:46:12 »
I just boiled some water for cooking noodles. As the water came to a boil bubbles started to form. Where and how do they form?






Look up surface tension in Wikipedia.


Please note that I included another phase change (crystal formation) in the question. Also, it does not explain why the bubbles formed at the same place over and over again.
 
The mind is like a parachute. It works best when open.  -- A. Einstein

*

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • 7709
    • View Profile
How do bubbles (and crystals) form?
« Reply #4 on: 16/03/2009 04:23:41 »
Air becomes less soluble in water as the temperature goes up.

*

Offline LeeE

  • Neilep Level Member
  • ******
  • 3382
    • View Profile
    • Spatial
How do bubbles (and crystals) form?
« Reply #5 on: 16/03/2009 14:10:49 »
I believe that I have read the form on "nucleation locations" where the phase change occurs but how and why?

I think this is because the two different states have overlapping ranges.  Without a trigger, there is no reason for the state to change if it moves from a region where there is no overlap to the overlapping region, but if there is a trigger it may cause the state to flip as either state is valid at that point.
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!

*

Offline neilep

  • Withdrawnmist
  • Naked Science Forum GOD!
  • *******
  • 20602
    • View Profile
How do bubbles (and crystals) form?
« Reply #6 on: 16/03/2009 17:27:28 »
I'm the only one allowed to ask about bubbles !!..and then I must repeatedly ask the same question about bubbles every 13 months !!.......oh...and then delete the thread and look embarrassed !!  [:-[] [:-[]
Men are the same as women, just inside out !

*

blakestyger

  • Guest
How do bubbles (and crystals) form?
« Reply #7 on: 16/03/2009 18:15:27 »
Bubbles form when the vapour pressure within the liqiud starts to exceed that above it.

*

Offline Bored chemist

  • Neilep Level Member
  • ******
  • 8752
    • View Profile
How do bubbles (and crystals) form?
« Reply #8 on: 16/03/2009 20:42:30 »
Bubbles form when the vapour pressure within the liqiud starts to exceed that above it.
Not reliably they don't. Sometimes they superheat then "bump" violently.
Please disregard all previous signatures.

*

Offline yor_on

  • Naked Science Forum GOD!
  • *******
  • 12188
  • (Ah, yes:) *a table is always good to hide under*
    • View Profile
How do bubbles (and crystals) form?
« Reply #9 on: 16/03/2009 22:32:01 »
It's a gas reading you all :)
"BOMB DISPOSAL EXPERT. If you see me running, try to keep up."

*

Offline LeeE

  • Neilep Level Member
  • ******
  • 3382
    • View Profile
    • Spatial
How do bubbles (and crystals) form?
« Reply #10 on: 18/03/2009 06:47:34 »
You're just fuming because you didn't get your answer in first.
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!

*

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • 7709
    • View Profile
How do bubbles (and crystals) form?
« Reply #11 on: 18/03/2009 06:53:00 »
Whoa, that comment had some heat on it.

*

Offline Madidus_Scientia

  • Neilep Level Member
  • ******
  • 1451
    • View Profile
How do bubbles (and crystals) form?
« Reply #12 on: 18/03/2009 19:37:36 »
Yeah, don't fire up

*

Offline dlorde

  • Neilep Level Member
  • ******
  • 1441
  • ex human-biologist & software developer
    • View Profile
How do bubbles (and crystals) form?
« Reply #13 on: 18/03/2009 20:58:55 »
Not reliably they don't. Sometimes they superheat then "bump" violently.
Indeed, and if you put a clean cup of tea into a microwave and heat it for longer than you should, then make the mistake of dropping sugar (or sometimes even just a spoon) into it, it can bump explosively, showering you with superheated tea. Many people have been badly scalded as a result of such 'accidents'.

p.s. DON'T TRY THIS AT HOME!