Removal of air from within and around food and from jars and canners. Blanching exhausts air from live food tissues. Exhausting or venting of pressure canners is necessary to prevent a risk of botulism in low-acid canned foods.

Removing air from within and around food and from canning jars. Venting of pressure and air from pressure canners.

having a debilitating effect; "an exhausting job in the hot sun"

producing exhaustion; "an exhausting march"; "the visit was especially wearing"

Producing exhaustion; as, exhausting labors.