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Liquid Boiling and Freezing at the Same Time by Formula88
Started on: 09-05-2015 08:48 PM
Replies: 7 (176 views)
Last post by: theogre on 09-06-2015 01:24 AM
Formula88
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Report this Post09-05-2015 08:48 PM Click Here to See the Profile for Formula88Send a Private Message to Formula88Edit/Delete MessageReply w/QuoteDirect Link to This Post

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MidEngineManiac
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Report this Post09-05-2015 09:03 PM Click Here to See the Profile for MidEngineManiacSend a Private Message to MidEngineManiacEdit/Delete MessageReply w/QuoteDirect Link to This Post
MUST be a female liquid....only females can be ice cold and boiling mad at the same time.
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84fiero123
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Report this Post09-05-2015 09:13 PM Click Here to See the Profile for 84fiero123Send a Private Message to 84fiero123Edit/Delete MessageReply w/QuoteDirect Link to This Post
Dogs and cats living together.


Oops I though we were just saying randome things and Ghost busters is on the TV in the back ground.


Edit to add

liquid nitrogen ?

Steve

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[This message has been edited by 84fiero123 (edited 09-05-2015).]

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Formula88
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Report this Post09-05-2015 09:39 PM Click Here to See the Profile for Formula88Send a Private Message to Formula88Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by 84fiero123:

liquid nitrogen ?

Steve


Unknown. The video description doesn't say. My guess is water with the temperature and pressure being held right at water's Triple Point (where water can exist as solid, liquid, and gas all at the same time).

Water's triple point:
32.018º F
0.088724029 psi


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Khw
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Report this Post09-05-2015 10:12 PM Click Here to See the Profile for KhwSend a Private Message to KhwEdit/Delete MessageReply w/QuoteDirect Link to This Post
This commonly happens in my house. I have water in the freezer freezing and water on the stove boiling.
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Gokart Mozart
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Report this Post09-05-2015 11:50 PM Click Here to See the Profile for Gokart MozartClick Here to visit Gokart Mozart's HomePageSend a Private Message to Gokart MozartEdit/Delete MessageReply w/QuoteDirect Link to This Post
Watch Cyclohexane Boil And Freeze At The Same Time

We think of freezing and boiling as opposites, things that happen at very different temperatures. However, under conditions of low air pressure the two can occur together, as we see in this video.

Substances can only be liquid in the presence of a gas to apply vapor pressure. If there is no pressure, or too little pressure, a substance will go straight from solid to gaseous phase as it warms. If you do this in an enclosed space the gas produced will build up, creating pressure as it does so, until a liquid phase is possible. If not enclosed, the gas will escape and the process can continue indefinitely.

The most familiar example is solid carbon dioxide, also known as dry ice. Liquid carbon dioxide needs much higher pressure than most other common substances. Under atmospheric pressure it will be a gas above -78.5C (-104.2F) and solid below that temperature. Take some solid carbon dioxide into a room and watch it go straight to gas (but careful, the extreme cold will “burn” you if you touch it).

The video above is what happens if a liquid is placed in conditions where the temperature is right at the point where it freezes and the gas pressure is removed. With no pressure it can't stay liquid, but it is right on the cusp between boiling and freezing, so it does a little of both. Going from liquid to gas absorbs energy, while liquid to solid changes release it. This can keep the process in balance - if too much material boils the temperature will fall, shifting the balance in favor of freezing.

Some coverage has wrongly described the video as showing the triple point. However, at the triple point gas, liquid and solid can all survive indefinitely. What we are seeing is what would happen anywhere along the dotted lines on the graph below to the left of the triple point.

We don't see this sort of thing often because if we performed such an experiment in a closed environment the boiling gas would build up pressure, allowing the remaining material to stay liquid. In the video that is addressed by constantly drawing off the vapor.
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Formula88
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Report this Post09-06-2015 01:22 AM Click Here to See the Profile for Formula88Send a Private Message to Formula88Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Gokart Mozart:
http://www.iflscience.com/c...and-freeze-same-time


Here's the graph referenced in your post.


From this video link:

 
quote
Tom Enstone 1 year ago
Flask of cyclohexane at room temperature, connected to a vacuum of about 10^-3 mbar. That's it!


 
quote
A volumetric flask containing liquid cyclohexane is depressurised to a very low pressure by a turbomolecular vacuum pump. The rapid drop in pressure results in a rapid drop in temperature, causing the substance to temporarily freeze, but the system is unstable, flirting with the triple point (a point of pressure and temperature at which a substance is simultaneously solid, liquid, and gas).
The result is a fluctuation between all three states of matter, in a rather stunning display of chemistry and physics in action.

[This message has been edited by Formula88 (edited 09-06-2015).]

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theogre
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Report this Post09-06-2015 01:24 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
Sound is likely a vacuum pump.

Water and maybe others can freeze and boil when under vacuum.

Is why you need to warm AC systems trying to draw moisture out using a vac pump.
In cool weather is very hard to impossible to draw water out from acc/drier and AC oils. Old mineral oil for R12 was bad but oils for R134 are worse. They love water about same as brake fluid.

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