Headspace
Why is headspace important in canning? VIDEO
Headspace, the distance between the surface of food and the underside of the lid, allows for expansion of food solids or bubbling up of liquid during processing. If headspace is not adequate, some food in the container will be forced out, leaving food particles or syrup on the sealing surface and preventing a seal. When too much headspace is allowed, some air may remain in the jar after processing, causing food at the top of the jar to darken. Adequate headspace allows a vacuum to form during the processing of the food.
Headspace, the distance between the surface of food and the underside of the lid, allows for expansion of food solids or bubbling up of liquid during processing. If headspace is not adequate, some food in the container will be forced out, leaving food particles or syrup on the sealing surface and preventing a seal. When too much headspace is allowed, some air may remain in the jar after processing, causing food at the top of the jar to darken. Adequate headspace allows a vacuum to form during the processing of the food.
Most common Canned Foods.
Q: Why is headspace important in canning?
A: Headspace is the distance between the surface of food and the underside of the lid. Leaving the specified amount of headspace in a jar is important to assure a vacuum seal. If too little headspace is allowed the food may expand and bubble out when air is being forced out from under the lid during processing. The bubbling food may leave a deposit on the rim of the jar or the seal of the lid and prevent the jar from sealing properly. If too much headspace is allowed, the food at the top is likely to discolor. Also, the jar may not seal properly because there will not be enough processing time to drive all the air out of the jar.
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HEADSPACE INFO
There’s a general rule of thumb for headspace that you should follow unless your recipe specifies otherwise.
- Jellies, jams, soft spreads, fruit juice: 1/4 inch ( 1/2 cm)
- Fruits, tomatoes, pickles, relishes, chutneys, condiments: 1/2 inch (1 cm)
- Low-acids: 1 to 1 1/4 inches (2 to 3 cm)
- Freezing: 1/2 inch(1 cm)
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