jar sealing

Jar sealing is a process that creates an airtight barrier between the jar’s contents and the outside environment. After filling a jar with food, the lid is placed on and typically heated or vacuumed to remove air, causing the lid to form a strong seal. This seal prevents bacteria, mold, and air from entering, which helps preserve the food’s freshness, flavor, and safety over time. Proper sealing is essential for long-term storage and is common in home canning and preserving methods.