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Vacuum sealers are also great for extending the shelf life of bulk dry goods, such as dried fruit, herbs and spices, or even flour and sugar. For non-powdery dry foods, like fruit, peppercorns or rice, I place the items in a mason jar and use the jar sealer attachment. This is also know as dry canning.
Manifold vacuum, or engine vacuum in an internal combustion engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the choked flow through a throttle in the intake manifold of an engine. It is a measure of the amount of restriction of airflow through the engine, and hence of the unused power capacity in the engine.