Does alcohol evaporate when left open?

Fae Morissette asked a question: Does alcohol evaporate when left open?
Asked By: Fae Morissette
Date created: Sat, Apr 17, 2021 1:24 PM

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Those who are looking for an answer to the question «Does alcohol evaporate when left open?» often ask the following questions:

❔ Can alcohol left open evaporate?

Absolutely. Alcohol evaporates even faster than water.

❔ Does isopropyl alcohol evaporate if left open?

Does isopropyl alcohol leave any residue when it evaporates? Residue left behind is not the alcohol but impurities dissolved in or mixed with the alcohol so pure isopropyl will not leave residue. The reason it is able to evaporate below its boiling point is the same reason that all other liquids can evaporate below their boiling points.

❔ Question: does alcohol evaporate if left open?

Will vodka evaporate if left open? In open bottles, alcohol can slowly evaporate over time. Never hide a prized bottle of liquor in a place like the attic, whether it’s open or not, as temperature extremes could cause it to lose flavor and punch..

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Residue left behind is not the alcohol but impurities dissolved in or mixed with the alcohol so pure isopropyl will not leave residue. The reason it is able to evaporate below its boiling point is the same reason that all other liquids can evaporate below their boiling points.

But once you open a bottle of wine and expose it to air, things start to change, and you’re right that evaporation comes into play. Both the water and the alcohol in wine are subject to evaporation, and typically the alcohol will evaporate somewhat faster than the water does.

So if the liquid is left out long enough, the liquid will evaporate completely. The atmosphere contains essentially no ethanol so an equilibrium between the whole atmosphere and the ethanol in a glass can never be reached.

Will vodka evaporate if left open? In open bottles, alcohol can slowly evaporate over time. Never hide a prized bottle of liquor in a place like the attic, whether it’s open or not, as temperature extremes could cause it to lose flavor and punch. How quickly does alcohol evaporate? After 15 minutes, 40% of the alcohol remains, after 30 minutes 35%, and only after two and a half hours 5%.

If an opened bottle of beer is left in a refrigerator overnight, the amount of alcohol that evaporates will likely be negligible, due to the low temperature and humidity. Bottom Line Leaving a bottle of beer open for an extended period of time can have many negative effects -- such as loss of carbonation, taste and aroma.

I understand that the small opening prevents a lot of air probably from getting to the alcohol wipes inside the container and evaporating all the alcohol away. (Feel free to correct my reasoning if I'm wrong - not a science person, but a liberal arts/social sciences dude.)

So preferentially, the alcohol will go first while the water remains and the concentration drops. You’ll eventually reach a point where an equal amount of water and alcohol are evaporating at the same time, at which point, the concentration steadies until the whole amount evaporates.

Pure alcohol left open will absorb water vapor from the air. This effect will limit to some extent how much alcohol evaporates. In effect any drink will drift very slowly towards the strength of 3.2% beer.

Unlike an open bottle, a properly sealed bottle of liquor can keep indefinitely without the taste being affected too much. It’s still important to store a sealed bottle away from light and in a place where the temperature doesn’t fluctuate, just to be safe. In open bottles, alcohol can slowly evaporate over time.

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