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To maximize the removal of entrained air by mechanical means, the stock must be exposed to a vacuum level that is sufficient to cause the stock to boil. This causes the free air bubbles to break and the dissolved air to come out of the water, be sprayed to maximize the surface area of the stock that is exposed to the vacuum, and impinge upon a hard surface to break the bound air bubbles away from the fibers. Most deaerators are designed to accomplish all three: boiling, spraying, and impingement.