By using plastic bottles filled with water, and then take an enameled basin nearly full, fill it with water. Then take a plastic bottle filled with water and turn it into an enameled basin one end of the rubber insert in the mouth, and one of his friends catch bottle.and then blow air out, most just one time, end-of-line rubber side note the results and measure the volume of air breathed out to replace the water in the bottle to try again since article 2 - 5 to 2 times, and average
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