Ingredient

Pressure canning

Also known as: pressure-canner, low-acid canning

The only USDA-approved home preservation method for low-acid foods (vegetables, meat, fish, soup) — a sealed pressure cooker brings jars to 240°F (116°C) at 10–15 PSI for sufficient time to destroy *Clostridium botulinum* spores, the pathogen that produces fatal botulism toxin and survives boiling-water temperatures indefinitely. The right ingredient when the goal is shelf-stable low-acid food: green beans, corn, beets, carrots, mushrooms, broth, meat, soup. Distinct from water-bath canning (only safe for high-acid foods like pickles, jam, fruit). Hobbyist canners $80–200 (Presto 23-quart, All American); commercial steam-canners higher. The single highest-stakes home-preservation technique — failure modes are lethal, success modes are 1–2 year shelf-stable.

Inputs / outputs

Pressure: 10–15 PSI depending on altitude (higher at altitude)
Temperature: 240°F (116°C) at 10 PSI
Time: 20–90 minutes depending on jar size and food
Equipment: weighted-gauge or dial-gauge pressure canner; canner is not the same as a pressure cooker (different volume + venting design)
Output: shelf-stable jars, 12–18 months at room temp

Solves / unlocks

Garden surplus preservation (tomatoes, beans, corn, peppers — anything from the harvest)
Soup-and-stock storage (chicken stock, beef bone broth, vegetable broth)
Meat preservation (canned chicken, beef, fish — alternative to freezing for [[off-grid-living|off-grid]])
Year-round eating from a single growing season
[[off-grid-living|Off-grid]] food security (no refrigeration required for canned goods)

Constraints

Botulism is the failure mode — C. botulinum produces a fatal neurotoxin in low-acid anaerobic environments; under-processing kills.
Use tested, USDA-approved recipes only — National Center for Home Food Preservation (https://nchfp.uga.edu/) is canonical. Modifying processing time or ingredient ratios is not creative — it’s how people get poisoned.
Altitude adjustment is mandatory above 1000 ft.
Dial-gauge canners need yearly calibration at a county-extension office.
Never repurpose pasta sauce or store-bought jars — only Mason jars with new lids each batch.
Botulism toxin is destroyed by 10 minutes of boiling; if a jar’s safety is in question, boil contents 10+ minutes before tasting.

Source

USDA Complete Guide to Home Canning: https://nchfp.uga.edu/publications/usda/GUIDE01_HomeCan_rev0715.pdf (free, definitive)
Ball Blue Book Guide to Preserving (the consumer canonical reference)
National Center for Home Food Preservation: https://nchfp.uga.edu/

What links here, and how

Inbound connections from across the wiki, grouped by lens and by relationship. These appear automatically — every entity page declares what it links to, and that data populates here on the targets.

Practical

contains

Preservation toolkit method / low-acid food canning, the only USDA-safe path for vegetables and meat

combines

Recipe: a year of eating from one growing season the method for low-acid vegetables, broth, meat, soup

combines with

Water-bath canning complementary canning method; water-bath for high-acid (pH<4.6), pressure for low-acid

3 inbound links · 3 outbound