Calculateur de Durée de Conservation Sous Vide — Formule
## How Vacuum Sealing Extends Shelf Life
### Principle
Vacuum sealing removes air from the package, which:
- Prevents oxidation (the main cause of freezer burn and rancidity)
- Slows aerobic bacterial growth (bacteria that need oxygen)
- Reduces moisture loss and dehydration
### Extension Factors
- **Refrigerator**: 2-3x normal life (raw meat: 3-5 days becomes 8-14 days)
- **Freezer**: 2-3x normal life (6 months becomes 1.5-2 years)
- **Pantry**: 2-2.5x for dry goods (rice, beans, flour)
### Limitations
Vacuum sealing does not kill bacteria already present. It is not a substitute for proper refrigeration or safe handling. Anaerobic bacteria (like botulism) can still grow in low-oxygen environments at unsafe temperatures.
### Principle
Vacuum sealing removes air from the package, which:
- Prevents oxidation (the main cause of freezer burn and rancidity)
- Slows aerobic bacterial growth (bacteria that need oxygen)
- Reduces moisture loss and dehydration
### Extension Factors
- **Refrigerator**: 2-3x normal life (raw meat: 3-5 days becomes 8-14 days)
- **Freezer**: 2-3x normal life (6 months becomes 1.5-2 years)
- **Pantry**: 2-2.5x for dry goods (rice, beans, flour)
### Limitations
Vacuum sealing does not kill bacteria already present. It is not a substitute for proper refrigeration or safe handling. Anaerobic bacteria (like botulism) can still grow in low-oxygen environments at unsafe temperatures.
Exemple Résolu
Vacuum-sealed cheese stored in the freezer (normally 5 days in fridge).
- Normal fridge life = 5 days
- Freezer extension factor = 3x
- Vacuum sealed freezer life = 5 x 3 = 15 days
- This is a rough estimate; hard cheese lasts much longer.