Most recent answer: 11/03/2015
If i have a bottle of wine in my car trunk.
It is 12.5% alcohol at what temp would it freeze?
- ron (age 58)
The freezing point would be lowered from 0 °C to about -6 °C by the
alcohol alone. In addition, there are some sugars, salts, etc. which
will lower the freezing point a little more.
It's important to realize, however, that the wine will not all
freeze if cooled down to that freezing point. When some ice starts to
form, it contains almost pure water, leaving the remaining liquid with
an increased concentration of alcohol etc, and hence a lower freezing
point. Pure ethanol has a freezing point of around -117 °C. So even if
your car gets cold, you'll get wine slush, not solid wine ice.
Nonetheless, if it's good wine, you shouldn't be carrying it around
in the trunk because it might be damaged by heat. Also, if some does
freeze, the increased volume of the ice (water is weird that way) might
increase the pressure enough to slide the cork out some, and degrade
the seal. If you were more unlucky, perhaps the ice could plug the neck
and the bottle might crack.
(published on 10/22/2007)
Follow-Up #1: freezing wine
While I understand wine shouldnt be left in a car trunk - my car is quite interesting. I could live comfortably on the contents for several weeks. So that would include wine. I lost 3 bottles of red wine when the freezing water in the wine pushed the cork out. It left quite the nasty stain (red wine) on my carpet and I was afraid to be pulled over by the police, because in effect, my entire car was an open container. So, at what temperature does the water in wine freeze? Adding in the variant of the car being closed, so it is slightly warmer than the outside. Does wind chill affect it?
- Jane (age 47)
Frostburg, MD, USA
Hi Jane- Sorry we had to spoil your spelling, but a glitch in our program rejects apostrophes in questions.
The precise initial freezing point of wine will depend mainly on the alcohol concentration but also on the amount of sugar and other solutes. A typical red wine should run about -6°C or 22°F. Since the wine left behind when a little has frozen will be more concentrated, the amount frozen will increase steadily below that initial freezing point.
Of course the car takes a while to cool down, so that gives you a little leeway. The time it takes to cool is shorter if the wind is blowing.
(published on 11/30/2007)
Follow-Up #2: making brandy
I make my own wine and the alcohol content is about 16%. By lowering the temperature enough to start freezing the water , do you think I can produce a brandy.
- scotty (age 77)
Seeley Lake, Montana
It should work. My great-grandfather used to do that with hard cider,
(published on 12/06/2007)
Follow-Up #3: Freezing point of Everclear alcohol-water mix
Why is the freezing temperature of everclear lower than the freezing temperature of water?
- Olin and Cash Middleton (age 32)
Hi Olin and Cash; welcome to the Physics Van.
As you probably know, Everclear is a potent mixture of ethyl alcohol and creekwater. It's alcoholic content is from 75 to 95 percent (150 to 190 proof). Here is a table that shows the freezing point of various mixtures of alcohol and water: the more alcohol, the lower the freezing point.
|Freezing Point |
(% by volume)
Now for an explanation of why different substances freeze at different temperatures. It's because the molecules that make them up are different. Some kinds of molecules have stronger forces holding molecules to each other than other kinds of molecules. In water, for example, the positively charged hydrogen end of the molecule electrostatically attracts the negatively charged part of neighboring water molecules to form "hydrogen bonds". These are responsible for the cohesion of water molecules in the liquid and the arrangement of water molecules in ice. Ethyl alcohol doesn't have that attractive end that form bonds.
Other kinds of substances have different freezing points. For example, nitrogen molecules have only very weak attractive forces between each other (although the bond between the two nitrogen atoms in an N2 molecule is very very strong). Consequently, nitrogen freezes at a much lower temperature than water. It even liquifies at a much lower temperature than water: -195.8 °Celsius. It freezes solid at -209.86 °C.
(published on 09/08/2011)
Follow-Up #4: making brandy
I'm trying to make brandy. I'm fermenting the mixture. When complete can I freeze the wine and invert the container to let the water melt and drain out. Would i than have brandy.
- Gil Linderman (age 67)
Mundelein, IL USA
This sounds backwards. The ice should be almost pure water. It's the liquid that will have all the alcohol and sugar, etc.
(published on 02/04/2012)
Follow-Up #5: frozen wine
Yes, I am waiting for it to thaw, and yes, I will sample it! But, was more curious as to the theoretical answer.
My forgotten Pinot Gris in the freezer over night is now a solid popsicle. Given that the H2o will freeze first, and the ethanol pure at -117C, Im assuming that that which has leaked out around the wine seal is the goodness? So, if alcoholic content is 13% and volume 750ml, should there be any frozen wine (and therefore h2o) spilt out, that would be an indicator that the frozen H2o volume exceeded the vessel and that there could be no room for the ethanol, correct? Or, could there be some ethanol 'trapped' in the wine? Can't actually see any liquid ethanol in the freezer, which I would have expected.
- Dan (age 31)
Queenstown, New Zealand
This is an interesting and obviously important question.The volume of the water + ethanol solution is a little lower, about 2%, than the sum of their separate volumes. () So separating them by freezing the water would cause 2% growth in volume in addition to the about 7% overall growth from the ~8% growth of the ice compared to liquid water. So you should get a net volume of ice +liquid around 820 ml or so. At most about 70 ml would be pushed out, less if you allow for a little air space to start with. There should have been about 97 ml of ethanol for starters, so as you say it seems like there should be some ethanol left. My guess is that it's more likely trapped in little cracks in the ice, with very little as individual molecules stuck in the ice.
(published on 12/31/2012)
Follow-Up #6: concentrating alcohol by freezing
I am intrested in using fractional crystallization to increase the alcohol content of home brewed alcohol, I know that the higher test beverages will require temperatures near -80 F range or lower but don't know where I need to be to get to 80% or 40 proof results, using a pot still or especially a reflux still will strip any flavor from the beverage while f/c will only intensify the flavor, your thoughts please.
- D. Sherman (age 53)
I've put this in a thread that discusses the same issue. Notice the table Lee included above.
It's unclear what you're aiming for, since 80% is 160 proof and 40% is 80 proof. If you're aiming for 40% alcohol, normal for a hard drink, that corresponds to a -10°F freezing point. Since there are other solutes in there (sugar, etc.) you'll need a slightly lower temperature.
If you're really aiming for 80% then you will need near -80°F, not as easy to reach.
(published on 01/27/2014)
Follow-Up #7: illegal to concentrate alcohol
Gentlemen:There is a thread on you website concerning distillation of alcohol [to make brandy] and using fractional freezing to increase alcohol content in wine/cider and other alcohol beverages.Both these processes are illegal in the United States and its territories unless you hold a license to distill alcohol from the Bureau of Alcohol, Firearms and Tobacco. The Physics Department really needs to note this when discussing distillation of alcohol for home use. If for no other reason than to protect the department and university from potential legal liability for telling people how to make "moonshine".The need to have a federal license does not apply to beer, wines, or ciders produced by fermentation for non-commercial use. Nor does it apply to cordials or liquors made by infusing a commercially produced distilled product with fruit, nuts or other flavors for non-commercial use.
- Stephanie Moidel (age 61)
Glen Carbon, IL USA
Interesting. Fortunately, my great-grandfather is beyond the reach of the law now.
(published on 11/03/2015)
Follow-up on this answer.