Vacu Vin 3-Piece Wine Saver Pump and Stopper Gift Pack, White
by Vacu Vin Inc.
Product Summary
Manufacturer: Vacu Vin Inc.Brand: Vacu Vin
Model: 98125
Product features:
- Reusable vacuum wine storage set ideal for all wine lovers
- Keeps open wine fresh for two weeks
- Correct usage puts an end to the oxidation process
- Includes 1 sturdy plastic pump and 2 high-quality rubber stoppers
- Hand washable; one-year warranty
- Vacu Vin Wine Saver Extra Stoppers, Set of 2
- Wine Enthusiast Private Preserve Wine Preservation Spray
Kitchen and Housewares Reviews of Vacu Vin 3-Piece Wine Saver Pump and Stopper Gift Pack, White
Customer Review: You can create a vacuum with a hand pump
Summary: 4 Stars
While I don't own this item (I have added it to my Christmas list), I would like to dispel a myth that has appeared in some of the reviews.
As a mechanical engineer who has designed vacuum chambers for over 16 years, I can tell you with great certainty that you can create a vacuum with a hand pump.
Technically, a vacuum is any pressure below atmosphere. If you can remove one molecule of gas with this hand pump you have created a vacuum. If you hear or feel air rush into the bottle when you remove the cork, you have created a vacuum.
The more relevant question is how strong of a vacuum can you create?
Since vacuum is simply a pressure (force/area) less than atmosphere, you can measure the "strength" of the vacuum by comparing the force differential across the pump. Atmospheric pressure at sea level is around 14.7 lb/in^2. If the area of the pump's piston is 1 in^2, you could create a complete vacuum with 14.7 pounds of force. In other words, you could create a complete vacuum with half the force needed to put air in your car's tire. The application of force to this pump is not the limiting factor in creating a vacuum.
The limiting factor will likely be the vapor pressure of the wine.
Due to the kinetics of the molecules in the liquid, there are always some molecules of wine that are ejected from the surface of the liquid. The rate at which these molecules are ejected is a function of temperature. If all the air molecules were removed from the bottle, a vapor would be created in the head space at the vapor pressure of the liquid.
Presuming that the wine was composed exclusively of ethanol and water, its vapor pressure would be around 53 torr or 1/14th of an atmosphere ([...]). The pressure in the wine bottle cannot be reduced below this point as long as liquid remains in the bottle.
A wine bottle opening is typically 18 mm, so a force of 5 pounds would be sufficient to remove all the air from the headspace. It should be noted that air may have diffused into the wine and predicting its extraction is complicated by a time element and potential chemical reactions between the wine and the oxygen. It should also be noted that mixing between the wine vapor and the air in the head space would likely result in some wine vapor being extracted during the pumping process, reducing the amount of air extracted proportionally. This effect would likely produce a first order response that may make it impossible to completely remove all air while wine vapor remains.
I don't how good the seals are on the Vacu Vin, but if it feels like you have to pull with about five pounds of force, you are getting a pretty strong vacuum. Less than 1 pound of force would produce a pretty weak vacuum that would leave more than 80% of the air in the bottle.
Either way, have fun.
Description of Vacu Vin 3-Piece Wine Saver Pump and Stopper Gift Pack, White
Vacu-Vin wine saver system. The only thing sadder than pouring spoiled wine down the drain is not opening it at all because you can't finish the bottle at one meal. The one and only, original Vacu-Vin, used in more than 10 million homes worldwide, is the easiest, most affordable way to preserve opened wines. The Vacu-Vin pump removes the air (and the oxygen that spoils wine) from opened bottles. Place it over the reusable stopper and pump out the air. The more stoppers you have, the more bottles you can save! One-year warranty. Includes one pump and two stoppers. Gift boxed. Fits any size or type wine bottle. Additonal stoppers available hereWine should breathe a little, but not overnight. Putting an end to the oxidation process, which turns a favorite Merlot into vinegar, is easy with the Vacu Vin Wine Saver. Made from high-quality rubber, which will not affect the taste of the wine, the Wine Saver uses a vacuum-style pump to release air to keep a wine fresh. And it's easy to use--just place a stopper in a bottle's neck, place the pump over the stopper, and pump air out until some resistance is felt. This process is suitable for preserving all but sparkling wines, and will save Chiantis, Syrahs, and others for up to two weeks. --Madeleine Miller
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