Home Canning FAQs: What is Headspace?

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Home Canning FAQs: What is Headspace?

Many canning recipes and directions refer to leaving "headspace in a jar"; usually around 1/2 inch; but what does this mean?


Headspace

The unfilled space above the food in a jar and below its lid is referred to as headspace. Directions for canning typically specify leaving 1/4-inch for jams and jellies, ½-inch for fruits and tomatoes to be processed in boiling water, and from 1- to 1¼-inches in low acid foods to be processed in a pressure canner.

This space is needed for expansion of food as jars are processed, and for forming vacuums in cooled jars. The extent of expansion is determined by the air content in the food and by the processing temperature. Air expands greatly when heated to high temperatures; the higher the temperature, the greater the expansion. Foods expand less than air when heated.  This is why you must leave more headspace when using a pressure canner!

Illustration of headspace.

 

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Home Canning Kits

Features:

Ball Enamel Waterbath Canner, Including Chrome-Plated Rack and 4-Piece Utensil Set

* All the tools you need for hot waterbath canning - in one comprehensive set!
* Complete with 21 1/2 qt. enameled waterbath canner
* Also includes canning rack, funnel, jar lifter, jar wrencher, bubble freer, tongs and lid lifter.
* A Kitchen Krafts exclusive collection.

This is the same type of standard canner that my grandmother used to make everything from applesauce to jams and jellies to tomato and spaghetti sauce. This complete kit includes everything you need and lasts for years: the canner, jar rack, jar grabber tongs, lid lifting wand, a plastic funnel, labels, bubble freer. It's much cheaper than buying the items separately. You'll never need anything else except jars & lids (and the jars are reusable)! There is also a simple kit with just the canner and rack, and a pressure canner, if you want to do vegetables (other than tomatoes). To see more canners, of different styles, makes and prices, click here!
Don't forget the Ball Blue Book!

Lids, Rings, Jars, mixes, pectin, etc.

Need lids, rings and replacement jars?  Or pectin to make jam, spaghetti sauce or salsa mix or pickle mixes?  Get them all here, and usually at lower prices than your local store!

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