While most nebulizers require an external power source, soft mist inhalers use a variety of methods other than electricity. The most widespread soft mist inhaler uses a spring to place pressure on a liquid container, causing the medication to spray out of its nozzles. Despite having less velocity than other types, soft mist inhalers can still deliver medication to the deepest parts of the lungs. Soft mist inhalers are sometimes called hand-powered nebulizers.

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