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by Ibrahim on 31 July 2011 - 20:07
by clc29 on 31 July 2011 - 20:07
Ok ...that was freaky...cool but freaky....
by Red Sable on 31 July 2011 - 22:07
That is cool Ibrahim. I've never noticed that, but I'll have to try it and see if it works. It must be something to do with air mixed in with the water.. Verrrry interesting. :)
by desert dog on 31 July 2011 - 23:07
My question would be why does it freeze in the refrigertor if it gets a little cold. barely at freezing temp.
Hank
Hank
by Myracle on 02 August 2011 - 20:08
Yes.
It's called "supercooling", wherein a substance gets below it's freezing point, without actually freezing.
A liquid is best supercooled when it relatively free of impurities.
When a liquid begins to freeze, it starts by forming ice crystals around an impurity in the liquid. Distilled or purified water, which is often what bottled water is, has few impurities, if any.
The bottled water in the video was left overnight in a truck. Prior to the temperature dropping low enough to freeze, the water was undisturbed long enough to allow the air and water to seperate. The bottle was then exposed to the freezing temps overnight. When the guy in the video picked the bottle up, he agitated the contents, allowing the air and water to re-mix. The air entering the water introduced impurities that acted as "seeds" for crystalization, and the water freezes.
I encountered supercooled bottled water a lot in Iraq, where the water was purified using reverse-osmosis.
It's called "supercooling", wherein a substance gets below it's freezing point, without actually freezing.
A liquid is best supercooled when it relatively free of impurities.
When a liquid begins to freeze, it starts by forming ice crystals around an impurity in the liquid. Distilled or purified water, which is often what bottled water is, has few impurities, if any.
The bottled water in the video was left overnight in a truck. Prior to the temperature dropping low enough to freeze, the water was undisturbed long enough to allow the air and water to seperate. The bottle was then exposed to the freezing temps overnight. When the guy in the video picked the bottle up, he agitated the contents, allowing the air and water to re-mix. The air entering the water introduced impurities that acted as "seeds" for crystalization, and the water freezes.
I encountered supercooled bottled water a lot in Iraq, where the water was purified using reverse-osmosis.
by Ibrahim on 02 August 2011 - 21:08
Thanks Mudwick, sound like a good explanation
Ibrahim
Ibrahim
by ggturner on 02 August 2011 - 23:08
by Myracle on 03 August 2011 - 00:08
The opposite phenomenon also exits- superheating.
This is especially dangerous when microwaving water on its own. If the water is free of impurities, it will not boil, even when heated to temps above its boiling point.
When an impurity [like a stirrer or spoon] is introduced, the superheated water flash-boils. Depending on how hot the water was, the flashboiling can potentially be so violent that the water erupts from the container and burns the person holding it.
Leaving a stir stick [or any other foreign object] in the cup of water during microwave heating prevents superheating.
This is especially dangerous when microwaving water on its own. If the water is free of impurities, it will not boil, even when heated to temps above its boiling point.
When an impurity [like a stirrer or spoon] is introduced, the superheated water flash-boils. Depending on how hot the water was, the flashboiling can potentially be so violent that the water erupts from the container and burns the person holding it.
Leaving a stir stick [or any other foreign object] in the cup of water during microwave heating prevents superheating.
by Ibrahim on 03 August 2011 - 00:08
that is a super cool article/project ggturner, thanks for sharing
Ibrahim
Ibrahim
by Ibrahim on 03 August 2011 - 00:08
Yes Mudwick I noticed that when I heat water to make coffe in the small kettle on the stove, when I add sugar to the water sometimes it suddenly boils in a flash causing water to pour out of the kettle.
Ibrahim
Ibrahim
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