WSET Level 1 Practice Question · Episode 84
Show Answer & Explanation (try the quiz first)
Practice Question
Which device is used to remove air from an opened bottle of wine to create a vacuum and keep it fresh for a few more days?
- A. Decanter
- B. Vacuum Pump
- C. Corkscrew
- D. Ice Bucket
Answer & Explanation
Answer: B. Vacuum Pump Explanation: The biggest enemy of wine once opened is 'Oxygen.' Long exposure to oxygen oxidizes the wine and changes its taste. A 'Vacuum Pump' uses a special stopper to pump out the oxygen from the bottle, slowing down oxidation. Another method is injecting heavy gases like nitrogen or argon to cover the surface of the wine. In any case, leftover wine should be kept in the fridge.
Key Theory Summary
Two technologies to protect leftover wine: 1. Vacuum System: Physically removes air from the bottle. (Most common) 2. Gas System: Injects argon or nitrogen to block contact with air. (Premium) 3. Refrigeration: Lowering the temperature slows down chemical reactions (oxidation). Always refrigerate leftover red wine as well.
Expert Exam Tip
[Trap]: Don't think "you should use a vacuum pump for sparkling wine." It will pump out the bubbles too! Sparkling wines need a special pressure stopper. [Tip]: If 'Remove air' or 'Preserve opened wine' appears in the exam, 'Vacuum pump' is the key answer.