Fahrenheit 32 the temp at which water freezes?

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12 Feb 2010, 9:19 pm

Scientists use temperature sensitive magnetic membrane to freeze water

the article states that if a a positive charge is used the water freezes at the bottom of the container, if a negative charge is used the water freezes as it should from the top down.

water is naturally paramagnetic, the hydrogen atoms concentrate on one side of the oxygen, creating a positive charge, the other side of the oxygen is negatively charged

http://www.livescience.com/strangenews/ ... 00211.html

pakled
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13 Feb 2010, 12:36 am

I know that you can get ice crystals at 34 degrees F, under certain conditions...

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20 Apr 2010, 3:35 pm

fahrenheit to celsius is deduct 32, then multiply by 5/9(or divide by 9/5, whatever)

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AspiInLV
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25 Apr 2010, 9:42 pm

sarek wrote:

fahrenheit to celsius is deduct 32, then multiply by 5/9(or divide by 9/5, whatever)

fahrenheit = 1.8(celsius - 32)

9/5 = 1.8
5/9 = .55556

Bones37
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27 Apr 2010, 3:07 am

At least it does at STP.
Change the pressure, and the temperature will change!

iamnotaparakeet
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27 Apr 2010, 3:21 am

Bones37 wrote:

At least it does at STP.
Change the pressure, and the temperature will change!

Yep, there's even a pressure and temperature at which water is ready to be either a solid, liquid, or gas, the triple point. 273.16 Kelvin and 611.73 Pascals. I think that these scientists here are using electrical charges to orient the water molecules in such as way as to require them to expend energy to reorient themselves.

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27 Apr 2010, 6:22 am

Pure water can be super-cooled so it remains liquid below the standard freezing point.

See http://en.wikipedia.org/wiki/Super_cooling

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27 Apr 2010, 7:30 am

Its fairly easy to observe. Bottled water is pure enough to do that. You can get it below freezing and it remains liquid. When you open the cap it ices up. Its pretty neat, taking only milliseconds.

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27 Apr 2010, 8:02 pm

AspiInLV wrote:

sarek wrote:

fahrenheit to celsius is deduct 32, then multiply by 5/9(or divide by 9/5, whatever)

fahrenheit = 1.8(celsius - 32)

9/5 = 1.8
5/9 = .55556

That would actually be:

Fahrenheit = 1.8*Celsius + 32

For example, boiling pure water at 1atm:

1.8*100 + 32 = 180 + 32 = 212

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27 Apr 2010, 9:55 pm

Fuzzy wrote:

Its fairly easy to observe. Bottled water is pure enough to do that. You can get it below freezing and it remains liquid. When you open the cap it ices up. Its pretty neat, taking only milliseconds.

That sometimes happens in the soda cooler at work, too, with bottles of whatever supercooled below freezing (0C) being liquid, but solidifying instantly when you jostle them the wrong way.

Freezing rain is drops of supercooled water solidifying on impact.

BTW, I have always wondered why the 'F' scale is set the weird way that it is. It makes no sense.

Mike

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27 Apr 2010, 10:49 pm

Wisguy wrote:

BTW, I have always wondered why the 'F' scale is set the weird way that it is. It makes no sense.

Mike

0 was the lowest temperature some guy named Fahrenheit could achieve at sea level using ice in a salt water solution. It kind of makes sense in terms of reproducibility. The high end is just weird though - according to Wikipedia he measured his wife's body temperature and set that at 96. The scale was later adjusted so that freezing and boiling points of water were exactly 180 degrees apart. That's why a "normal" body temperature is said to be 98.6.

Basically, the scale makes no sense any more other than the fact that people are used to it in the US.

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